[Bug 1908469] Re: Cannot install .deb packages opened from Firefox

[Cas]

As others have suggested this is a snap app issue with /tmp dirs and can
be verified with:

gnome-software --local-filename '/tmp/mozilla_user0/app_amd64.deb'

snap-store --local-filename '/tmp/mozilla_user0/app_amd64.deb'

I have added workaround to AU to use 'gnome-software' for opening debs:
https://askubuntu.com/a/1330582/8570

I did also find an alterntive workaround so that all snap apps have
access to /tmp: https://askubuntu.com/a/1264341/8570

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https://bugs.launchpad.net/bugs/1908469

Title:
  Cannot install .deb packages opened from Firefox

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