root@debianserver:/# cat /proc/self/mountinfo
17 22 0:17 / /sys rw,nosuid,nodev,noexec,relatime shared:8 - sysfs sysfs rw
18 22 0:4 / /proc rw,nosuid,nodev,noexec,relatime shared:14 - proc proc rw
19 22 0:6 / /dev rw,nosuid,relatime shared:3 - devtmpfs udev rw,size=74254448k,nr_inodes=18563612,mode=755
20 19 0:18 / /dev/pts rw,nosuid,noexec,relatime shared:4 - devpts devpts rw,gid=5,mode=620,ptmxmode=000
21 22 0:19 / /run rw,nosuid,noexec,relatime shared:6 - tmpfs tmpfs rw,size=14853476k,mode=755
22 0 8:2 / / rw,relatime shared:1 - ext4 /dev/sda2 rw,errors=remount-ro,data=ordered
23 22 8:5 / /usr rw,relatime shared:2 - ext4 /dev/sda5 rw,data=ordered
24 17 0:14 / /sys/kernel/security rw,nosuid,nodev,noexec,relatime shared:9 - securityfs securityfs rw
25 19 0:20 / /dev/shm rw,nosuid,nodev shared:5 - tmpfs tmpfs rw
26 21 0:21 / /run/lock rw,nosuid,nodev,noexec,relatime shared:7 - tmpfs tmpfs rw,size=5120k
27 17 0:22 / /sys/fs/cgroup ro,nosuid,nodev,noexec shared:10 - tmpfs tmpfs ro,mode=755
28 27 0:23 / /sys/fs/cgroup/systemd rw,nosuid,nodev,noexec,relatime shared:11 - cgroup cgroup rw,xattr,release_agent=/lib/systemd/systemd-cgroups-agent,name=systemd
29 17 0:24 / /sys/fs/pstore rw,nosuid,nodev,noexec,relatime shared:12 - pstore pstore rw
30 17 0:25 / /sys/firmware/efi/efivars rw,nosuid,nodev,noexec,relatime shared:13 - efivarfs efivarfs rw
31 27 0:26 / /sys/fs/cgroup/blkio rw,nosuid,nodev,noexec,relatime shared:15 - cgroup cgroup rw,blkio
32 27 0:27 / /sys/fs/cgroup/memory rw,nosuid,nodev,noexec,relatime shared:16 - cgroup cgroup rw,memory
33 27 0:28 / /sys/fs/cgroup/net_cls,net_prio rw,nosuid,nodev,noexec,relatime shared:17 - cgroup cgroup rw,net_cls,net_prio
34 27 0:29 / /sys/fs/cgroup/freezer rw,nosuid,nodev,noexec,relatime shared:18 - cgroup cgroup rw,freezer
35 27 0:30 / /sys/fs/cgroup/devices rw,nosuid,nodev,noexec,relatime shared:19 - cgroup cgroup rw,devices
36 27 0:31 / /sys/fs/cgroup/perf_event rw,nosuid,nodev,noexec,relatime shared:20 - cgroup cgroup rw,perf_event
37 27 0:32 / /sys/fs/cgroup/pids rw,nosuid,nodev,noexec,relatime shared:21 - cgroup cgroup rw,pids
38 27 0:33 / /sys/fs/cgroup/cpu,cpuacct rw,nosuid,nodev,noexec,relatime shared:22 - cgroup cgroup rw,cpu,cpuacct
39 27 0:34 / /sys/fs/cgroup/cpuset rw,nosuid,nodev,noexec,relatime shared:23 - cgroup cgroup rw,cpuset,clone_children
40 18 0:35 / /proc/sys/fs/binfmt_misc rw,relatime shared:24 - autofs systemd-1 rw,fd=33,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=9849
66 19 0:16 / /dev/mqueue rw,relatime shared:25 - mqueue mqueue rw
69 17 0:7 / /sys/kernel/debug rw,relatime shared:26 - debugfs debugfs rw
67 19 0:36 / /dev/hugepages rw,relatime shared:27 - hugetlbfs hugetlbfs rw
72 21 0:37 / /run/rpc_pipefs rw,relatime shared:28 - rpc_pipefs sunrpc rw
74 18 0:38 / /proc/fs/nfsd rw,relatime shared:29 - nfsd nfsd rw
77 22 8:7 / /tmp rw,relatime shared:30 - ext2 /dev/sda7 rw,block_validity,barrier,user_xattr,acl
80 23 8:6 / /usr/local rw,relatime shared:31 - ext4 /dev/sda6 rw,data=ordered
82 22 8:4 / /var rw,relatime shared:32 - ext4 /dev/sda4 rw,data=ordered
78 22 0:40 / /home rw,relatime shared:33 - btrfs /dev/sda8 rw,space_cache,subvolid=5,subvol=/
83 22 8:9 / /boot/efi rw,relatime shared:34 - vfat /dev/sda9 rw,fmask=0077,dmask=0077,codepage=437,iocharset=ascii,shortname=mixed,utf8,errors=remount-ro
334 82 0:45 / /var/lib/lxcfs rw,nosuid,nodev,relatime shared:262 - fuse.lxcfs lxcfs rw,user_id=0,group_id=0,allow_other
341 17 0:44 / /sys/fs/fuse/connections rw,relatime shared:268 - fusectl fusectl rw
391 21 0:46 / /run/user/1000 rw,nosuid,nodev,relatime shared:316 - tmpfs tmpfs rw,size=14853472k,mode=700,uid=1000,gid=1000
191 21 0:19 /snapd/ns /run/snapd/ns rw,nosuid,noexec,relatime - tmpfs tmpfs rw,size=14853476k,mode=755
450 21 0:56 / /run/user/114 rw,nosuid,nodev,relatime shared:420 - tmpfs tmpfs rw,size=14853472k,mode=700,uid=114,gid=118
608 450 0:57 / /run/user/114/gvfs rw,nosuid,nodev,relatime shared:430 - fuse.gvfsd-fuse gvfsd-fuse rw,user_id=114,group_id=118
620 391 0:58 / /run/user/1000/gvfs rw,nosuid,nodev,relatime shared:440 - fuse.gvfsd-fuse gvfsd-fuse rw,user_id=1000,group_id=1000
447 22 0:59 / /media/memyself/lxd2 rw,nosuid,nodev,relatime shared:251 - btrfs /dev/loop3 rw,space_cache,user_subvol_rm_allowed,subvolid=5,subvol=/
791 40 0:75 / /proc/sys/fs/binfmt_misc rw,relatime shared:475 - binfmt_misc binfmt_misc rw
1042 22 7:12 / /snap/lxd/5785 ro,nodev,relatime shared:457 - squashfs /dev/loop12 ro
1007 22 7:14 / /snap/lxd/5841 ro,nodev,relatime shared:503 - squashfs /dev/loop14 ro
997 22 7:13 / /snap/lxd/5866 ro,nodev,relatime shared:486 - squashfs /dev/loop13 ro
1679 22 7:18 / /snap/core/4117 ro,nodev,relatime shared:38 - squashfs /dev/loop18 ro
1597 191 0:3 mnt:[4026533162] /run/snapd/ns/lxd.mnt rw - nsfs nsfs rw
1604 22 7:16 / /snap/core/4127 ro,nodev,relatime shared:499 - squashfs /dev/loop16 ro
1068 22 7:17 / /snap/core/4133 ro,nodev,relatime shared:77 - squashfs /dev/loop17 ro
744 22 7:19 / /snap/core/4144 ro,nodev,relatime shared:76 - squashfs /dev/loop19 ro
root@debianserver:/# ls -lh /sys/kernel/security
total 0
drwxr-xr-x 4 root root 0 Feb 7 17:44 apparmor
drwxr-xr-x 2 root root 0 Feb 7 17:44 ima
-rw-r–r-- 1 root root 0 Feb 7 17:44 securelevel
root@debianserver:/# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-4.9.0-5-amd64 root=UUID=fcbadb58-3013-4917-b3ac-d6029b323ee7 ro quiet apparmor=1 security=apparmor
I tried a number of times to remove apparmor in the process of trying to setup a second disk (btrfs) connection. Even when I removed and purged both snapd and lxd it was impossible to install snapd without apparmor being dragged along.
When I left said containers everything was working and I was able to not only access but to work with the previously setup containers. After a few days I wanted to setup some more containers and that’s when the ‘useful’ error line appeared.