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When I type:

$ mount|grep snap
/var/lib/snapd/snaps/ubuntu-core_352.snap on /snap/ubuntu-core/352 type squashfs (ro,relatime)
/var/lib/snapd/snaps/ubuntu-core_423.snap on /snap/ubuntu-core/423 type squashfs (ro,relatime)
/var/lib/snapd/snaps/ubuntu-core_122.snap on /snap/ubuntu-core/122 type squashfs (ro,relatime)

I see several old snap "mounted" and available while only the latest version is used as current in /snap/ubuntu-core

It's not a big deal but do I need older ubuntu core ? Isn't this a bug there are not deleted ? Could I simply unmount and delete the files ?

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4 Answers 4

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33 
  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

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  • 4
    Considering current package name, up to date command looks like: sudo snap remove core --revision 122
    – dess
    Commented Mar 13, 2017 at 15:17
  • 4
    snap list --all to list installed packages with all revisions. Check also how to remove all disabled snap packages.
    – Pablo Bianchi
    Commented Sep 8, 2018 at 18:49
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To completley remove snap core, snap and mounted filesystems:

  1. 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

  2. Remove disabled ones first snap remove core --revision 7713 notice the Rev column in step 1 should match --revision

  3. Uninstall snapd (on Ubuntu: apt-get purge snapd)

  4. Findout if snap is still mounted (for example df -H) gives something like
    /dev/loop0 94M 94M 0 100% /snap/core/7917 and unmount it umount /snap/core/7917 but it shouldn't

  5. If 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...

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4

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

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  • In my case, the last command sudo rm /var/lib/snapd/snaps/ubuntu-core_122.snap was non necessary.
    – Serge Stroobandt
    Commented Oct 21, 2017 at 15:22
  • gist.github.com/tsbertalan/f49f892a58d2a0889358e5b6b64af028 Here's a gist that automates this for multiple mounts. It doesn't actually run its commands; just prints what you would run, which is easy enough to change.
    – tsbertalan
    Commented Nov 24, 2018 at 18:58
  • yout script removes all the snaps. This is not what you want !
    – solsTiCe
    Commented Nov 24, 2018 at 19:19
  • sudo: unmount: command not found .... ?
    – Rabbit
    Commented May 16, 2019 at 16:40
  • Perfect! Finally a way to remove snaps that snapd somehow forgot about and does not list in sudo snap list --all. Happened to me for the openscad-nightly snap for some reason.
    – tanius
    Commented Nov 19, 2020 at 23:38
3

This is done, so you can snap revert to rollback to an older snap version.

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