How to unmount and possibly delete old Ubuntu Core snap
sudo snap remove core --revision 122
sudo snap remove core --revision 352
So, basically passing the revisions to remove in the command line.
To check the ones you've installed you have to use snap list [snap-name] --all
To completley remove snap core, snap and mounted filesystems:
List installed snap cores
snap list --all
should give you something like:Name Version Rev Tracking Publisher Notes core 16-2.41 7713 stable canonical✓ core,disabled core 16-2.42 7917 stable canonical✓ core
Remove disabled ones first
snap remove core --revision 7713
notice the Rev column in step 1 should match --revisionUninstall snapd (on Ubuntu:
apt-get purge snapd
)Findout if snap is still mounted (for example
df -H
) gives something like
/dev/loop0 94M 94M 0 100% /snap/core/7917
and unmount itumount /snap/core/7917
but it shouldn'tIf there are still mounted fs-es, you should attempt manual cleanup of /etc/systemd/system/snap-core-* something files.
Next time when your server reboots, snaps won't be there, unless you install/remove snapd again from some reason...
So I unmount the old snap:
sudo umount /snap/ubuntu-core/122
and then done some manual clean up
sudo rmdir /snap/ubuntu-core/122
sudo rm /var/lib/snapd/snaps/ubuntu-core_122.snap
The same for the other one. The sky did not fall... yet