Snapcraft runs multipass setup but fails

[fcole90]

I was setting up snapcraft on a new laptop, but running snapcraft required multipass, so snapcraft installed it correctly but then it failed as follows

```
snapcraft
Support for 'multipass' needs to be set up. Would you like to do it now? [y/N]: y
multipass 1.5.0 from Canonical✓ installed
Waiting for multipass...
Launching a VM.
Build environment is in unknown state, cleaning first.
delete failed: The following errors occurred:
instance "snapcraft-folding-at-home-fcole90" does not exist
An error occurred with the instance when trying to delete with 'multipass': returned exit code 2.
Ensure that 'multipass' is setup correctly and try again.
```

The name of my snap is folding-at-home-fcole90
Snap available here: https://github.com/fcole90/fah-snap

[fcole90 (fcole90)]

I think this is quite bad, as it's one of the first commands one runs as a newbie and it fails in an unclear way, so it's not clear how to proceed

[fcole90 (fcole90)]

Running the command again, fixed it..

[Chris Patterson (cjp256)]

Fix PR: https://github.com/snapcore/snapcraft/pull/3381

[fcole90 (fcole90)]

Great! Amazing speed!

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/1904774