[Bug 1966589] Re: release upgrade fails due to `firefox package pre-installation script subprocess returned error exit status 1`

[Grzegorz Żur]

I beg to differ.

The error still occurs on 2020 LTS and on 2022 LTS upgrades. The
workaround is to open xterm and run `killall snap`. Only then the
upgrade can progress with an error.

Use xterm because at this point other terminal emulators don't work.

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Title:
  release upgrade fails due to `firefox package pre-installation script
  subprocess returned error exit status 1`

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