Snapd LXD exec: aa-exec: Permission denied

[Andrew Cloke]

After having "snap remove lxd" and "snap install lxd", I'm getting the following issue:

$ lxc
cat: /proc/self/attr/current: Permission denied
snap/lxd/15359/commands/lxc: 6: exec: aa-exec: Permission denied

[Andrew Cloke (andrew-cloke)]

"systemd-analyze plot" output

[Andrew Cloke (andrew-cloke)]

lxd snap connections appear to be "unplugged":

$ snap connections lxd
Interface Plug Slot Notes
lxd - lxd:lxd -
lxd-support lxd:lxd-support - -
network lxd:network - -
network-bind lxd:network-bind - -
system-observe lxd:system-observe - -

[Andrew Cloke (andrew-cloke)]

$ snap list core
Name Version Rev Tracking Publisher Notes
core 16-2.45 9289 latest/stable canonical✓ core

[Andrew Cloke (andrew-cloke)]

$ systemd-analyze critical-chain snapd.service
The time when unit became active or started is printed after the "@" character.
The time the unit took to start is printed after the "+" character.

snapd.service +12.817s
└─basic.target @2.641s
  └─sockets.target @2.641s
    └─snapd.socket @2.637s +2ms
      └─sysinit.target @2.617s
        └─systemd-timesyncd.service @2.347s +268ms
          └─systemd-tmpfiles-setup.service @2.324s +20ms
            └─local-fs.target @2.316s
              └─boot-efi.mount @2.306s +8ms
                └─systemd-fsck@dev-disk-by\x2duuid-DEA6\x2dE70F.service @1.871s +428ms
                  └─dev-disk-by\x2duuid-DEA6\x2dE70F.device @1.806s

[Andrew Cloke (andrew-cloke)]

$ systemd-analyze critical-chain snap-core-9289.mount
The time when unit became active or started is printed after the "@" character.
The time the unit took to start is printed after the "+" character.

snap-core-9289.mount +1.735s
└─local-fs-pre.target @483ms
  └─systemd-tmpfiles-setup-dev.service @428ms +53ms
    └─systemd-sysusers.service @401ms +19ms
      └─systemd-remount-fs.service @358ms +28ms
        └─systemd-journald.socket @317ms
          └─system.slice @292ms
            └─-.slice @292ms

[Andrew Cloke (andrew-cloke)]

$ snap interfaces > tmp7.txt

[Andrew Cloke (andrew-cloke)]

$ snap list snapd
error: no matching snaps installed

[Andrew Cloke (andrew-cloke)]

$ snap changes
ID Status Spawn Ready Summary
194 Done today at 08:02 BST today at 08:02 BST Disable "lxd" snap
195 Done today at 08:05 BST today at 08:10 BST Remove "lxd" snap
196 Done today at 08:49 BST today at 08:49 BST Forget of snapshot set #12
197 Done today at 08:49 BST today at 08:49 BST Forget of snapshot set #13
198 Done today at 08:49 BST today at 08:49 BST Install "lxd" snap
199 Done today at 13:35 BST today at 13:35 BST Disable "juju" snap
200 Done today at 13:38 BST today at 13:38 BST Remove "juju" snap
201 Done today at 13:43 BST today at 13:43 BST Remove "lxd" snap
202 Done today at 14:02 BST today at 14:02 BST Install "lxd" snap
203 Done today at 14:04 BST today at 14:04 BST Install "juju" snap
204 Done today at 14:08 BST today at 14:08 BST Remove "lxd" snap
205 Done today at 14:08 BST today at 14:08 BST Forget of snapshot set #14
206 Done today at 14:08 BST today at 14:08 BST Forget of snapshot set #15
207 Done today at 14:08 BST today at 14:08 BST Forget of snapshot set #16
208 Done today at 14:11 BST today at 14:11 BST Install "lxd" snap
209 Done today at 14:15 BST today at 14:15 BST Remove "lxd" snap
210 Done today at 14:19 BST today at 14:19 BST Refresh all snaps: no updates
211 Done today at 14:19 BST today at 14:20 BST Install "lxd" snap

[Andrew Cloke (andrew-cloke)]

$ snap interfaces
Slot Plug
lxd:lxd -
- juju:peers
- lxd:lxd-support
- lxd:network
- lxd:network-bind
- lxd:system-observe
'snap interfaces' is deprecated; use 'snap connections'.

[Andrew Cloke (andrew-cloke)]

$ journalctl -u snapd.service

Output in https://paste.ubuntu.com/p/3ynNJWStPW/

[Andrew Cloke (andrew-cloke)]

$ snap list --all

Output in https://paste.ubuntu.com/p/bCCvWfwYmK/

[Andrew Cloke (andrew-cloke)]

$ cat /proc/self/mountinfo

Output in https://paste.ubuntu.com/p/VM4TyqXsws/

[Andrew Cloke (andrew-cloke)]

$ ls -l /snap/core/9289/meta
total 1
drwxr-xr-x 2 root root 32 May 12 17:49 hooks
-rw-r--r-- 1 root root 181 May 12 17:49 snap.yaml

[Andrew Cloke (andrew-cloke)]

Issue resolved by restarting snapd service and reconnecting the lxd "plugs":
$ sudo systemctl restart snapd.service
$ for i in :lxd-support :network :network-bind :system-observe ; do sudo snap connect lxd$i ; done