I have a VMs that I play with from time to time, and Snaps would “lose” their connections, and can’t launch because of that.
$ firefox
sed: can't read /home/yamiyukisenpai/.config/user-dirs.dirs: Permission denied
/snap/firefox/5889/gnome-platform/command-chain/desktop-launch: line 290: /home/yamiyukisenpai/.config/user-dirs.dirs: Permission denied
cp: cannot open '/home/yamiyukisenpai/.config/user-dirs.locale' for reading: Permission denied
/snap/firefox/5889/gnome-platform/command-chain/desktop-launch: line 295: /home/yamiyukisenpai/.config/user-dirs.locale: Permission denied
[12785] Wayland Proxy [0x7d3394b60be0] Error: CheckWaylandDisplay(): Failed to connect to Wayland display '/run/user/1000/snap.firefox/wayland-0' error: Permission denied
Error: we don't have any display, WAYLAND_DISPLAY='wayland-0' DISPLAY=':1'
$ snap connections firefox
Interface Plug Slot Notes
alsa firefox:alsa - -
audio-playback firefox:audio-playback - -
audio-record firefox:audio-record - -
avahi-observe firefox:avahi-observe - -
browser-support firefox:browser-sandbox - -
camera firefox:camera - -
content[gnome-42-2204] firefox:gnome-42-2204 gnome-42-2204:gnome-42-2204 -
content[gtk-3-themes] firefox:gtk-3-themes gtk-common-themes:gtk-3-themes -
content[icon-themes] firefox:icon-themes gtk-common-themes:icon-themes -
content[icon-themes] firefox:icon-themes icon-theme-breeze:icon-themes -
content[sound-themes] firefox:sound-themes gtk-common-themes:sound-themes -
cups-control firefox:cups-control - -
dbus - firefox:dbus-daemon -
desktop firefox:desktop - -
desktop-legacy firefox:desktop-legacy - -
gsettings firefox:gsettings - -
hardware-observe firefox:hardware-observe - -
home firefox:home - -
joystick firefox:joystick - -
login-session-observe firefox:login-session-observe - -
mount-control firefox:host-hunspell - -
mount-observe firefox:mount-observe - -
mpris - firefox:mpris -
network firefox:network - -
network-bind firefox:network-bind - -
network-observe firefox:network-observe - -
opengl firefox:opengl - -
pcscd firefox:pcscd - -
personal-files firefox:dot-mozilla-firefox - -
removable-media firefox:removable-media - -
screen-inhibit-control firefox:screen-inhibit-control - -
system-files firefox:etc-firefox - -
system-files firefox:host-usr-share-hunspell - -
system-packages-doc firefox:system-packages-doc - -
u2f-devices firefox:u2f-devices - -
unity7 firefox:unity7 - -
upower-observe firefox:upower-observe - -
wayland firefox:wayland - -
x11 firefox:x11 - -
$ snap connections steam
Interface Plug Slot Notes
audio-playback steam:audio-playback - -
audio-record steam:audio-record - -
bluez steam:bluez - -
content[gaming-mesa] steam:gaming-mesa gaming-graphics-core22:gaming-mesa -
content[gtk-3-themes] steam:gtk-3-themes gtk-common-themes:gtk-3-themes -
content[icon-themes] steam:icon-themes gtk-common-themes:icon-themes -
content[icon-themes] steam:icon-themes icon-theme-breeze:icon-themes -
content[sound-themes] steam:sound-themes gtk-common-themes:sound-themes -
dbus - steam:steam -
desktop steam:desktop - -
desktop-legacy steam:desktop-legacy - -
fuse-support steam:fuse-support - -
gsettings steam:gsettings - -
hardware-observe steam:hardware-observe - -
home steam:home - -
joystick steam:joystick - -
mount-observe steam:mount-observe - -
network steam:network - -
network-bind steam:network-bind - -
network-control steam:network-control - -
opengl steam:opengl - -
personal-files steam:dot-local-share-applications - -
personal-files steam:dot-local-share-icons - -
personal-files steam:dot-local-share-steam - -
process-control steam:process-control - -
removable-media steam:removable-media - -
screen-inhibit-control steam:screen-inhibit-control - -
shared-memory steam:shmem - -
steam-support steam:steam-support - -
system-observe steam:system-observe - -
uinput steam:uinput - -
upower-observe steam:upower-observe - -
wayland steam:wayland - -
x11 steam:x11 - -
One thing to note is that I moved the all Snaps-related stuff (i.e. /snap, /var/snap, /var/lib/snapd) to another disk (Btrfs, with subvolumes)
# UniversalApp
LABEL="UniversalApp" /snap btrfs defaults,subvol=@snap 0 2
LABEL="UniversalApp" /var/lib/snapd btrfs defaults,subvol=@var-lib-snapd 0 2
LABEL="UniversalApp" /var/snap btrfs defaults,subvol=@var-snap 0 2
Any ideas on how to bring them all back? And any ideas as to what I could be missing?
Journal seems to show failed mounts?
$ sudo journalctl -b0 | grep -i snapd
Mar 16 15:44:25 KDENeon-KVM systemd[1]: Reached target snapd.mounts-pre.target - Mounting snaps.
Mar 16 15:44:25 KDENeon-KVM systemd[1]: Mounting var-lib-snapd.mount - /var/lib/snapd...
Mar 16 15:44:25 KDENeon-KVM systemd[1]: Mounted var-lib-snapd.mount - /var/lib/snapd.
Mar 16 15:44:26 KDENeon-KVM systemd[1]: Mounting snap-snapd-23545.mount - Mount unit for snapd, revision 23545...
Mar 16 15:44:26 KDENeon-KVM systemd[1]: Mounting snap-snapd-23771.mount - Mount unit for snapd, revision 23771...
Mar 16 15:44:26 KDENeon-KVM systemd[1]: Mounting snap-snapd-24014.mount - Mount unit for snapd, revision 24014...
Mar 16 15:44:26 KDENeon-KVM systemd[1]: Mounting snap-snapd-24249.mount - Mount unit for snapd, revision 24249...
Mar 16 15:44:26 KDENeon-KVM systemd[1]: Mounting snap-snapd-24320.mount - Mount unit for snapd, revision 24320...
Mar 16 15:44:26 KDENeon-KVM systemd[1]: Mounting snap-snapd\x2ddesktop\x2dintegration-253.mount - Mount unit for snapd-desktop-integration, revision 253...
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/core_17200.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/core_16928.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/core18_2846.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/bitwarden_106.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[618]: mount: /snap/core18/2846: special device /var/lib/snapd/snaps/core18_2846.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[614]: mount: /snap/core/16928: special device /var/lib/snapd/snaps/core_16928.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[608]: mount: /snap/bitwarden/106: special device /var/lib/snapd/snaps/bitwarden_106.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[615]: mount: /snap/core/17200: special device /var/lib/snapd/snaps/core_17200.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/core18_2812.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[617]: mount: /snap/core18/2812: special device /var/lib/snapd/snaps/core18_2812.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[623]: mount: /snap/core22/1033: special device /var/lib/snapd/snaps/core22_1033.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[631]: mount: /snap/discord-canary/358: special device /var/lib/snapd/snaps/discord-canary_358.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/core22_1033.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/discord-canary_358.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/firefox_5460.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/core22_1722.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/firefox_edge_3997.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/core18_2796.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/cups_1024.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/firefox_3643.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[635]: mount: /snap/firefox/5460: special device /var/lib/snapd/snaps/firefox_5460.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[633]: mount: /snap/firefox/3643: special device /var/lib/snapd/snaps/firefox_3643.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/core20_2182.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[624]: mount: /snap/core22/1722: special device /var/lib/snapd/snaps/core22_1722.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[616]: mount: /snap/core18/2796: special device /var/lib/snapd/snaps/core18_2796.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[638]: mount: /snap/firefox_edge/3997: special device /var/lib/snapd/snaps/firefox_edge_3997.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[628]: mount: /snap/cups/1024: special device /var/lib/snapd/snaps/cups_1024.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[620]: mount: /snap/core20/2182: special device /var/lib/snapd/snaps/core20_2182.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/cups_1041.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/firefox_5278.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/firefox_edge_5522.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[629]: mount: /snap/cups/1041: special device /var/lib/snapd/snaps/cups_1041.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[634]: mount: /snap/firefox/5278: special device /var/lib/snapd/snaps/firefox_5278.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[640]: mount: /snap/firefox_edge/5522: special device /var/lib/snapd/snaps/firefox_edge_5522.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/firefox_edge_4147.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/gaming-graphics-core22_166.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/core20_2264.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/firefox_edge_5874.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/firefox_edge_5532.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/core24_609.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/firefox_edge_5880.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[642]: mount: /snap/firefox_edge/5874: special device /var/lib/snapd/snaps/firefox_edge_5874.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[639]: mount: /snap/firefox_edge/4147: special device /var/lib/snapd/snaps/firefox_edge_4147.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[621]: mount: /snap/core20/2264: special device /var/lib/snapd/snaps/core20_2264.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[641]: mount: /snap/firefox_edge/5532: special device /var/lib/snapd/snaps/firefox_edge_5532.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[626]: mount: /snap/core24/609: special device /var/lib/snapd/snaps/core24_609.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/gaming-graphics-core22_154.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[645]: mount: /snap/gaming-graphics-core22/154: special device /var/lib/snapd/snaps/gaming-graphics-core22_154.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[643]: mount: /snap/firefox_edge/5880: special device /var/lib/snapd/snaps/firefox_edge_5880.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[646]: mount: /snap/gaming-graphics-core22/166: special device /var/lib/snapd/snaps/gaming-graphics-core22_166.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[648]: mount: /snap/gnome-3-28-1804/194: special device /var/lib/snapd/snaps/gnome-3-28-1804_194.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/gnome-42-2204_176.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/gnome-3-28-1804_194.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/gnome-3-38-2004_140.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/gnome-3-38-2004_143.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[650]: mount: /snap/gnome-3-38-2004/140: special device /var/lib/snapd/snaps/gnome-3-38-2004_140.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[651]: mount: /snap/gnome-3-38-2004/143: special device /var/lib/snapd/snaps/gnome-3-38-2004_143.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[653]: mount: /snap/gnome-42-2204/176: special device /var/lib/snapd/snaps/gnome-42-2204_176.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/kde-frameworks-5-qt-5-15-3-core20_8.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[675]: mount: /snap/kde-frameworks-5-qt-5-15-3-core20/8: special device /var/lib/snapd/snaps/kde-frameworks-5-qt-5-15-3-core20_8.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/kdenlive_105.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/htop_4079.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/gnome-42-2204_141.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[677]: mount: /snap/kdenlive/105: special device /var/lib/snapd/snaps/kdenlive_105.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/kde-frameworks-5-99-qt-5-15-7-core20_7.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/gnome-46-2404_48.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[663]: mount: /snap/htop/4079: special device /var/lib/snapd/snaps/htop_4079.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[652]: mount: /snap/gnome-42-2204/141: special device /var/lib/snapd/snaps/gnome-42-2204_141.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[655]: mount: /snap/gnome-46-2404/48: special device /var/lib/snapd/snaps/gnome-46-2404_48.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[674]: mount: /snap/kde-frameworks-5-99-qt-5-15-7-core20/7: special device /var/lib/snapd/snaps/kde-frameworks-5-99-qt-5-15-7-core20_7.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[664]: mount: /snap/htop/4317: special device /var/lib/snapd/snaps/htop_4317.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/htop_4317.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/kf5-5-110-qt-5-15-11-core22_3.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/steam_154.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/kf6-core22_43.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[685]: mount: /snap/kf6-core22/43: special device /var/lib/snapd/snaps/kf6-core22_43.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/htop_4407.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/jellyfinmediaplayer_25.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[704]: mount: /snap/steam/154: special device /var/lib/snapd/snaps/steam_154.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[683]: mount: /snap/kf5-5-110-qt-5-15-11-core22/3: special device /var/lib/snapd/snaps/kf5-5-110-qt-5-15-11-core22_3.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/mesa-2404_143.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/snapd_23771.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[665]: mount: /snap/htop/4407: special device /var/lib/snapd/snaps/htop_4407.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/vlc_4046.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/jellyfinmediaplayer_24.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[669]: mount: /snap/jellyfinmediaplayer/25: special device /var/lib/snapd/snaps/jellyfinmediaplayer_25.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[699]: mount: /snap/snapd/23771: special device /var/lib/snapd/snaps/snapd_23771.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[707]: mount: /snap/vlc/4046: special device /var/lib/snapd/snaps/vlc_4046.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[668]: mount: /snap/jellyfinmediaplayer/24: special device /var/lib/snapd/snaps/jellyfinmediaplayer_24.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[682]: mount: /snap/kf5-5-108-qt-5-15-10-core22/5: special device /var/lib/snapd/snaps/kf5-5-108-qt-5-15-10-core22_5.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[687]: mount: /snap/mesa-2404/143: special device /var/lib/snapd/snaps/mesa-2404_143.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[697]: mount: /snap/snap-store/1017: special device /var/lib/snapd/snaps/snap-store_1017.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/kf5-5-108-qt-5-15-10-core22_5.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/snap-store_1017.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/kf5-5-105-qt-5-15-9-core22_11.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/qt-common-themes_10.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/snap-store_1013.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/nvtop_171.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/kdenlive_103.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[694]: mount: /snap/qt-common-themes/10: special device /var/lib/snapd/snaps/qt-common-themes_10.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/hunspell-dictionaries-1-7-2004_2.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/obs-studio_1307.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/kde-frameworks-5-99-qt-5-15-7-core20_15.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[691]: mount: /snap/nvtop/171: special device /var/lib/snapd/snaps/nvtop_171.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[676]: mount: /snap/kdenlive/103: special device /var/lib/snapd/snaps/kdenlive_103.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[679]: mount: /snap/kf5-5-105-qt-5-15-9-core22/11: special device /var/lib/snapd/snaps/kf5-5-105-qt-5-15-9-core22_11.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[696]: mount: /snap/snap-store/1013: special device /var/lib/snapd/snaps/snap-store_1013.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[693]: mount: /snap/obs-studio/1307: special device /var/lib/snapd/snaps/obs-studio_1307.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/nvtop_116.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[673]: mount: /snap/kde-frameworks-5-99-qt-5-15-7-core20/15: special device /var/lib/snapd/snaps/kde-frameworks-5-99-qt-5-15-7-core20_15.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[666]: mount: /snap/hunspell-dictionaries-1-7-2004/2: special device /var/lib/snapd/snaps/hunspell-dictionaries-1-7-2004_2.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[690]: mount: /snap/nvtop/116: special device /var/lib/snapd/snaps/nvtop_116.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[684]: mount: /snap/kf5-5-111-qt-5-15-11-core22/7: special device /var/lib/snapd/snaps/kf5-5-111-qt-5-15-11-core22_7.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/kf5-5-111-qt-5-15-11-core22_7.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/kf5-5-106-qt-5-15-9-core22_23.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/steam_200.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/gtk-common-themes_1534.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/kde-frameworks-5-98-qt-5-15-6-core20_9.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[681]: mount: /snap/kf5-5-106-qt-5-15-9-core22/23: special device /var/lib/snapd/snaps/kf5-5-106-qt-5-15-9-core22_23.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[705]: mount: /snap/steam/200: special device /var/lib/snapd/snaps/steam_200.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[657]: mount: /snap/gtk-common-themes/1534: special device /var/lib/snapd/snaps/gtk-common-themes_1534.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/kde-frameworks-5-96-qt-5-15-5-core20_7.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/snapd_23545.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/htop_3873.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/kf5-5-105-qt-5-15-9-core22_9.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM kernel: /var/lib/snapd/snaps/snapd_24014.snap: Can't lookup blockdev
Mar 16 15:44:27 KDENeon-KVM mount[672]: mount: /snap/kde-frameworks-5-98-qt-5-15-6-core20/9: special device /var/lib/snapd/snaps/kde-frameworks-5-98-qt-5-15-6-core20_9.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[671]: mount: /snap/kde-frameworks-5-96-qt-5-15-5-core20/7: special device /var/lib/snapd/snaps/kde-frameworks-5-96-qt-5-15-5-core20_7.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[698]: mount: /snap/snapd/23545: special device /var/lib/snapd/snaps/snapd_23545.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[680]: mount: /snap/kf5-5-105-qt-5-15-9-core22/9: special device /var/lib/snapd/snaps/kf5-5-105-qt-5-15-9-core22_9.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[662]: mount: /snap/htop/3873: special device /var/lib/snapd/snaps/htop_3873.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM mount[700]: mount: /snap/snapd/24014: special device /var/lib/snapd/snaps/snapd_24014.snap does not exist.
Mar 16 15:44:27 KDENeon-KVM systemd[1]: snap-snapd-23545.mount: Mount process exited, code=exited, status=32/n/a
Mar 16 15:44:27 KDENeon-KVM systemd[1]: snap-snapd-23545.mount: Failed with result 'exit-code'.
Mar 16 15:44:27 KDENeon-KVM systemd[1]: Failed to mount snap-snapd-23545.mount - Mount unit for snapd, revision 23545.
Mar 16 15:44:27 KDENeon-KVM systemd[1]: snap-snapd-23771.mount: Mount process exited, code=exited, status=32/n/a
Mar 16 15:44:27 KDENeon-KVM systemd[1]: snap-snapd-23771.mount: Failed with result 'exit-code'.
Mar 16 15:44:27 KDENeon-KVM systemd[1]: Failed to mount snap-snapd-23771.mount - Mount unit for snapd, revision 23771.
Mar 16 15:44:27 KDENeon-KVM systemd[1]: snap-snapd-24014.mount: Mount process exited, code=exited, status=32/n/a
Mar 16 15:44:27 KDENeon-KVM systemd[1]: snap-snapd-24014.mount: Failed with result 'exit-code'.
Mar 16 15:44:27 KDENeon-KVM systemd[1]: Failed to mount snap-snapd-24014.mount - Mount unit for snapd, revision 24014.
Mar 16 15:44:27 KDENeon-KVM systemd[1]: Mounted snap-snapd-24249.mount - Mount unit for snapd, revision 24249.
Mar 16 15:44:27 KDENeon-KVM systemd[1]: Mounted snap-snapd-24320.mount - Mount unit for snapd, revision 24320.
Mar 16 15:44:27 KDENeon-KVM systemd[1]: Mounted snap-snapd\x2ddesktop\x2dintegration-253.mount - Mount unit for snapd-desktop-integration, revision 253.
Mar 16 15:44:27 KDENeon-KVM systemd[1]: Reached target snapd.mounts.target - Mounted snaps.
...
So far, I got 3 VMs with shared Snap directories: Ubuntu Unity (devel), KDE Neon Unstable, KDE Neon Testing.
I tested a similar setup before on a laptop that has multiple OS’s and it didn’t have the same problem.