Comment 13 for bug 1966203

Some updates, while I'm still investigating this on a QEMU running Ubuntu Core 22.

The "snap auto-import" command is only needed on Ubuntu Core systems, so the plan is to remove the /lib/udev/rules.d/66-snapd-autoimport.rules from the snapd deb package (and consequently also from the snapd snap).

We do still need it in UC, but as a matter of fact the script is already provided by the Ubuntu Core repositories:

- UC22: https://github.com/snapcore/core-base/blob/main/static/usr/lib/udev/rules.d/66-snapd-autoimport.rules
- UC20: https://github.com/snapcore/core20/blob/master/static/usr/lib/udev/rules.d/66-snapd-autoimport.rules
- UC18: https://github.com/snapcore/core18/blob/master/static/lib/udev/rules.d/66-snapd-autoimport.rules
- UC16: **missing**

The file in UC22 seems already correct, in that it does not call unshare. So the only one left out is UC16, where we will add the udev rule that we currently have in snapd; after that, we will remove the rule from snapd and this bug for the desktop will be gone for good.

There is a remaining problem, however: the systemd-udevd.service in Ubuntu 22 disallows the mount operation, so we'll have to update the unit file to allow it. I think we'll also need to update the auto-import command itself, because it appears that all errors while accessing the devices are silenced, so we would have never known of this problem, if it wasn't for this bug report.