Snap is not working(cannot determine nfs usage in generateSystemKey: cannot parse /etc/fstab: expected at least 3 fields, found 1)

snapd
42 
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
# / was on /dev/nvme0n1p7 during installation
UUID=8111861c-4fe5-4b02-8d34-a62a4bf3c7e2 /               ext4    errors=remount-ro 0       1
# /boot/efi was on /dev/nvme0n1p1 during installation
UUID=AC94-952F  /boot/efi       vfat    umask=0077      0       1
/swapfile                                 none            swap    sw              0       0
#/dev/disk/by-uuid/01D60CFF0BF1D440
#/dev/sdb1 /media/bart/Elements1 ext3 defaults 0 2
43

Sorry, I have found the backticks ```.

Should I run “sudo disable snap” and “sudo enable snap”?

44

The core22 error is gone: I can run Firefox again! One of the problems is gone. Thx

2 Likes
45

To disable en enable snap I used the following commands: sudo apt purge snapd and sudo apt install snapd

Unfortunately this did not result in “Thunderbird” “VLC Media Player” and “Teams for Linux” to start working again.

Snap changes does not sho any active error messages.

What to do?

46

When I try to install Thunderbird I get the following error: ��<�pre><�font color=“#26A269”><�b>bart@VostroBart<�/b><�/font>:<�font color=“#12488B”><�b>~<�/b><�/font>$ sudo snap install thunderbird [sudo] password for bart: error: cannot perform the following tasks: - Mount snap "thunderbird" (751) (cannot proceed, expected snap "thunderbird" revision 751 to be mounted but is not) <�font color=“#26A269”><�b> bart@VostroBart<�/b><�/font>:<�font color=“#12488B”><�b>~<�/b><�/font>$ ^C <�font color=“#26A269”><�b> bart@VostroBart<�/b><�/font>:<�font color=“#12488B”><�b>~<�/b><�/font>$ <�/pre>

47

With VLC Media Player I also get an error: sudo snap install vlc error: cannot perform the following tasks:

  • Mount snap “vlc” (3777) (cannot proceed, expected snap “vlc” revision 3777 to be mounted but is not)
48

Sorry the message about Thunderbird better readable: sudo snap install thunderbird [sudo] password for bart: error: cannot perform the following tasks:

  • Mount snap “thunderbird” (751) (cannot proceed, expected snap “thunderbird” revision 751 to be mounted but is not)
49

Again, try

sudo snap disable vlc

And afterwards

sudo snap enable vlc

And see if that re-creates the systemd mount unit proper… Same for the thunderbird snap…

50

unfortunately this gives an error message:

error: snap “vlc” is not installed

For Thunderbird the same

51

This leads also to an error message in snap changes: ID Status Spawn Ready Summary 22 Done yesterday at 15:31 CEST yesterday at 15:31 CEST Schakel “core22” snap uit 23 Done yesterday at 15:31 CEST yesterday at 15:31 CEST Schakel “core22” snap in 24 Done yesterday at 15:39 CEST yesterday at 15:39 CEST Refresh snaps “firefox”, “snap-store”, “snapd-desktop-integration” 25 Error today at 11:07 CEST today at 11:07 CEST Snap “thunderbird” installeren 26 Error today at 11:10 CEST today at 11:11 CEST Snap “vlc” installeren

52

Status Spawn Ready Summary Done today at 11:07 CEST today at 11:07 CEST Ensure prerequisites for “thunderbird” are available Undone today at 11:07 CEST today at 11:07 CEST Download snap “thunderbird” (751) from channel “stable” Done today at 11:07 CEST today at 11:07 CEST Fetch and check assertions for snap “thunderbird” (751) Error today at 11:07 CEST today at 11:07 CEST Mount snap “thunderbird” (751) Hold today at 11:07 CEST today at 11:07 CEST Copy snap “thunderbird” data Hold today at 11:07 CEST today at 11:07 CEST Setup snap “thunderbird” (751) security profiles Hold today at 11:07 CEST today at 11:07 CEST Make snap “thunderbird” (751) available to the system Hold today at 11:07 CEST today at 11:07 CEST Automatisch geschikte plugs en slots van snap “thunderbird” aansluiten Hold today at 11:07 CEST today at 11:07 CEST Set automatic aliases for snap “thunderbird” Hold today at 11:07 CEST today at 11:07 CEST Setup snap “thunderbird” aliases Hold today at 11:07 CEST today at 11:07 CEST Run install hook of “thunderbird” snap if present Hold today at 11:07 CEST today at 11:07 CEST Run default-configure hook of “thunderbird” snap if present Hold today at 11:07 CEST today at 11:07 CEST Start snap “thunderbird” (751) services Hold today at 11:07 CEST today at 11:07 CEST Run configure hook of “thunderbird” snap if present Hold today at 11:07 CEST today at 11:07 CEST Run health check of “thunderbird” snap

… Mount snap “thunderbird” (751)

2025-07-20T11:07:21+02:00 ERROR cannot proceed, expected snap “thunderbird” revision 751 to be mounted but is not

53

snap change 26 Status Spawn Ready Summary Done today at 11:10 CEST today at 11:11 CEST Ensure prerequisites for “vlc” are available Undone today at 11:10 CEST today at 11:11 CEST Download snap “vlc” (3777) from channel “stable” Done today at 11:10 CEST today at 11:11 CEST Fetch and check assertions for snap “vlc” (3777) Error today at 11:10 CEST today at 11:11 CEST Mount snap “vlc” (3777) Hold today at 11:10 CEST today at 11:11 CEST Copy snap “vlc” data Hold today at 11:10 CEST today at 11:11 CEST Setup snap “vlc” (3777) security profiles Hold today at 11:10 CEST today at 11:11 CEST Make snap “vlc” (3777) available to the system Hold today at 11:10 CEST today at 11:11 CEST Automatisch geschikte plugs en slots van snap “vlc” aansluiten Hold today at 11:10 CEST today at 11:11 CEST Set automatic aliases for snap “vlc” Hold today at 11:10 CEST today at 11:11 CEST Setup snap “vlc” aliases Hold today at 11:10 CEST today at 11:11 CEST Run install hook of “vlc” snap if present Hold today at 11:10 CEST today at 11:11 CEST Run default-configure hook of “vlc” snap if present Hold today at 11:10 CEST today at 11:11 CEST Start snap “vlc” (3777) services Hold today at 11:10 CEST today at 11:11 CEST Run configure hook of “vlc” snap if present Hold today at 11:10 CEST today at 11:11 CEST Run health check of “vlc” snap Done today at 11:10 CEST today at 11:10 CEST Ensure prerequisites for “core18” are available Done today at 11:10 CEST today at 11:11 CEST Download snap “core18” (2923) from channel “stable” Done today at 11:10 CEST today at 11:11 CEST Fetch and check assertions for snap “core18” (2923) Done today at 11:10 CEST today at 11:11 CEST Mount snap “core18” (2923) Done today at 11:10 CEST today at 11:11 CEST Copy snap “core18” data Done today at 11:10 CEST today at 11:11 CEST Setup snap “core18” (2923) security profiles Done today at 11:10 CEST today at 11:11 CEST Make snap “core18” (2923) available to the system Done today at 11:10 CEST today at 11:11 CEST Automatisch geschikte plugs en slots van snap “core18” aansluiten Done today at 11:10 CEST today at 11:11 CEST Set automatic aliases for snap “core18” Done today at 11:10 CEST today at 11:11 CEST Setup snap “core18” aliases Done today at 11:10 CEST today at 11:11 CEST Run install hook of “core18” snap if present Done today at 11:10 CEST today at 11:11 CEST Start snap “core18” (2923) services Done today at 11:10 CEST today at 11:11 CEST Run health check of “core18” snap

… Mount snap “vlc” (3777)

2025-07-20T11:11:24+02:00 ERROR cannot proceed, expected snap “vlc” revision 3777 to be mounted but is not

54 
snap change 26
Status  Spawn                Ready                Summary
Done    today at 11:10 CEST  today at 11:11 CEST  Ensure prerequisites for "vlc" are available
Undone  today at 11:10 CEST  today at 11:11 CEST  Download snap "vlc" (3777) from channel "stable"
Done    today at 11:10 CEST  today at 11:11 CEST  Fetch and check assertions for snap "vlc" (3777)
Error   today at 11:10 CEST  today at 11:11 CEST  Mount snap "vlc" (3777)
Hold    today at 11:10 CEST  today at 11:11 CEST  Copy snap "vlc" data
Hold    today at 11:10 CEST  today at 11:11 CEST  Setup snap "vlc" (3777) security profiles
Hold    today at 11:10 CEST  today at 11:11 CEST  Make snap "vlc" (3777) available to the system
Hold    today at 11:10 CEST  today at 11:11 CEST  Automatisch geschikte plugs en slots van snap "vlc" aansluiten
Hold    today at 11:10 CEST  today at 11:11 CEST  Set automatic aliases for snap "vlc"
Hold    today at 11:10 CEST  today at 11:11 CEST  Setup snap "vlc" aliases
Hold    today at 11:10 CEST  today at 11:11 CEST  Run install hook of "vlc" snap if present
Hold    today at 11:10 CEST  today at 11:11 CEST  Run default-configure hook of "vlc" snap if present
Hold    today at 11:10 CEST  today at 11:11 CEST  Start snap "vlc" (3777) services
Hold    today at 11:10 CEST  today at 11:11 CEST  Run configure hook of "vlc" snap if present
Hold    today at 11:10 CEST  today at 11:11 CEST  Run health check of "vlc" snap
Done    today at 11:10 CEST  today at 11:10 CEST  Ensure prerequisites for "core18" are available
Done    today at 11:10 CEST  today at 11:11 CEST  Download snap "core18" (2923) from channel "stable"
Done    today at 11:10 CEST  today at 11:11 CEST  Fetch and check assertions for snap "core18" (2923)
Done    today at 11:10 CEST  today at 11:11 CEST  Mount snap "core18" (2923)
Done    today at 11:10 CEST  today at 11:11 CEST  Copy snap "core18" data
Done    today at 11:10 CEST  today at 11:11 CEST  Setup snap "core18" (2923) security profiles
Done    today at 11:10 CEST  today at 11:11 CEST  Make snap "core18" (2923) available to the system
Done    today at 11:10 CEST  today at 11:11 CEST  Automatisch geschikte plugs en slots van snap "core18" aansluiten
Done    today at 11:10 CEST  today at 11:11 CEST  Set automatic aliases for snap "core18"
Done    today at 11:10 CEST  today at 11:11 CEST  Setup snap "core18" aliases
Done    today at 11:10 CEST  today at 11:11 CEST  Run install hook of "core18" snap if present
Done    today at 11:10 CEST  today at 11:11 CEST  Start snap "core18" (2923) services
Done    today at 11:10 CEST  today at 11:11 CEST  Run health check of "core18" snap

......................................................................
Mount snap "vlc" (3777)

2025-07-20T11:11:24+02:00 ERROR cannot proceed, expected snap "vlc" revision 3777 to be mounted but is not
55 
snap change 25
Status  Spawn                Ready                Summary
Done    today at 11:07 CEST  today at 11:07 CEST  Ensure prerequisites for "thunderbird" are available
Undone  today at 11:07 CEST  today at 11:07 CEST  Download snap "thunderbird" (751) from channel "stable"
Done    today at 11:07 CEST  today at 11:07 CEST  Fetch and check assertions for snap "thunderbird" (751)
Error   today at 11:07 CEST  today at 11:07 CEST  Mount snap "thunderbird" (751)
Hold    today at 11:07 CEST  today at 11:07 CEST  Copy snap "thunderbird" data
Hold    today at 11:07 CEST  today at 11:07 CEST  Setup snap "thunderbird" (751) security profiles
Hold    today at 11:07 CEST  today at 11:07 CEST  Make snap "thunderbird" (751) available to the system
Hold    today at 11:07 CEST  today at 11:07 CEST  Automatisch geschikte plugs en slots van snap "thunderbird" aansluiten
Hold    today at 11:07 CEST  today at 11:07 CEST  Set automatic aliases for snap "thunderbird"
Hold    today at 11:07 CEST  today at 11:07 CEST  Setup snap "thunderbird" aliases
Hold    today at 11:07 CEST  today at 11:07 CEST  Run install hook of "thunderbird" snap if present
Hold    today at 11:07 CEST  today at 11:07 CEST  Run default-configure hook of "thunderbird" snap if present
Hold    today at 11:07 CEST  today at 11:07 CEST  Start snap "thunderbird" (751) services
Hold    today at 11:07 CEST  today at 11:07 CEST  Run configure hook of "thunderbird" snap if present
Hold    today at 11:07 CEST  today at 11:07 CEST  Run health check of "thunderbird" snap

......................................................................
Mount snap "thunderbird" (751)

2025-07-20T11:07:21+02:00 ERROR cannot proceed, expected snap "thunderbird" revision 751 to be mounted but is not
56 
Hold    today at 11:07 CEST  today at 11:07 CEST  Setup snap "thunderbird" aliases
Hold    today at 11:07 CEST  today at 11:07 CEST  Run install hook of "thunderbird" snap if present
Hold    today at 11:07 CEST  today at 11:07 CEST  Run default-configure hook of "thunderbird" snap if present
Hold    today at 11:07 CEST  today at 11:07 CEST  Start snap "thunderbird" (751) services
Hold    today at 11:07 CEST  today at 11:07 CEST  Run configure hook of "thunderbird" snap if present
Hold    today at 11:07 CEST  today at 11:07 CEST  Run health check of "thunderbird" snap

......................................................................
Mount snap "thunderbird" (751)

2025-07-20T11:07:21+02:00 ERROR cannot proceed, expected snap "thunderbird" revision 751 to be mounted but is not
57

��<�pre>2025-07-20T11:07:21+02:00 ERROR cannot proceed, expected snap "thunderbird" revision 751 to be mounted but is not <�/pre>

58 
Hold    today at 11:10 CEST  today at 11:11 CEST  Run health check of "vlc" snap
Done    today at 11:10 CEST  today at 11:10 CEST  Ensure prerequisites for "core18" are available
Done    today at 11:10 CEST  today at 11:11 CEST  Download snap "core18" (2923) from channel "stable"
Done    today at 11:10 CEST  today at 11:11 CEST  Fetch and check assertions for snap "core18" (2923)
Done    today at 11:10 CEST  today at 11:11 CEST  Mount snap "core18" (2923)
Done    today at 11:10 CEST  today at 11:11 CEST  Copy snap "core18" data
Done    today at 11:10 CEST  today at 11:11 CEST  Setup snap "core18" (2923) security profiles
Done    today at 11:10 CEST  today at 11:11 CEST  Make snap "core18" (2923) available to the system
Done    today at 11:10 CEST  today at 11:11 CEST  Automatisch geschikte plugs en slots van snap "core18" aansluiten
Done    today at 11:10 CEST  today at 11:11 CEST  Set automatic aliases for snap "core18"
Done    today at 11:10 CEST  today at 11:11 CEST  Setup snap "core18" aliases
Done    today at 11:10 CEST  today at 11:11 CEST  Run install hook of "core18" snap if present
Done    today at 11:10 CEST  today at 11:11 CEST  Start snap "core18" (2923) services
Done    today at 11:10 CEST  today at 11:11 CEST  Run health check of "core18" snap

......................................................................
Mount snap "vlc" (3777)

2025-07-20T11:11:24+02:00 ERROR cannot proceed, expected snap "vlc" revision 3777 to be mounted but is not
59

��<�pre>2025-07-20T11:11:24+02:00 ERROR cannot proceed, expected snap "vlc" revision 3777 to be mounted but is not <�/pre>

60

Thank you very much!! It worked! I did an update, again disabled and enabled core22 and now I could install Thunderbird and VLC. I am very gratefull to you all :wave: :ok_hand:

1 Like