Unable to access lxd snap after resore from old backup

1

I have zfs on root system which was upgraded from ubuntu 20.04 to ubuntu 20.10

I wanted to remove old snapshots. I used the -R option as a result I removed the /var/snap pool. I do not have a backup for 20.10, but I used the backup of /var/snap from 20.04 to restore. Now all my snaps are broken. Most importantly the lxd snap.

Snap refresh lxd:
snap “lxd” has no updates available

When I try to install and old version
snap refresh --channel=4.6/stable lxd I get:

error: cannot perform the following tasks:

  • Setup snap “lxd” (17738) security profiles (cannot find installed snap “lxd” at revision 18137: missing file /snap/lxd/18137/meta/snap.yaml)
  • Start snap “lxd” (17738) services ([start snap.lxd.activate.service] failed with exit status 1: Job for snap.lxd.activate.service failed because the control process exited with error code.

Is there any way to to restore the lxd snap

2

It should definitely be possible to recover from this. I think the easiest may be to:

  • Move /var/snap/lxd/common/lxd somewhere safe
  • Completely remove the LXD snap
  • Reboot the system to make sure things are clean
  • Install the LXD snap, this should behave like a completely clean LXD
  • snap stop lxd
  • Delete /var/snap/lxd/common/lxd and move back the one you saved earlier
  • snap start lxd