I am running Ubuntu 16.10 with snapd and the basic core snap installed since it was released.
After some time I observed that the /snap/core directory fills up with multiple older versions.
To remove them I'll have to execute sudo snap remove core --revision <number> manually.
Multiple versions of snaps & garbage collection section in
Snaps and snapcraft documentation explains that after every update of a snap package the current version and the one before are installed and older versions are getting automatically removed (just as it was earlier the case).
As I cannot find further information in snap help, I am asking whether there is a setting or a switch command in snapd to enable automatic removal of those older core snap packages.
Additional information : What I described is valid for 3 machines with the same configuration.
Best Answer
Right now I don't believe it's possible to change the number of old versions of any snap, that's set at 3. If you see more than that, it's likely a bug, so should be filed at https://bugs.launchpad.net/ubuntu/+source/snapd