Comment 2 for bug 1975736

Hello,

We usually prefer for support questions to be asked at https://discuss.linuxcontainers.org and issues be filed at https://github.com/lxc/lxd/issues.

We only really look at Launchpad for bugs in the LXD deb which these days is limited to Ubuntu 18.04 as everything afterwards is using the snap.

In this particular instance, you're most likely dealing with an outdated LXD agent setup which is keeping the 9p mount active and preventing the stateful snapshot.

You may be able to update the setup by running:
 - cd /run/lxd_agent
 - ./install.sh
 - reboot

This should refresh the systemd units used to start the agent with a current version.