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:
tmp will not work for some applications; any link explaining exactly
why/when/how? is it just because of snap - or other things too?
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Title:
The snap store as a snap isn't going to have access to the share /tmp so
that would be an issue yes
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Title:
Cannot install .deb packages opened
In my case, it could be because "Ubuntu Software" is really "snap-store"
and for some reason, it can't install it from that directory. Could be
that the problem is on snap-store and not in Firefox?
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: firefox (Ubuntu)
Status: New => Confirmed
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** Package changed: ubiquity (Ubuntu) => firefox (Ubuntu)
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Title:
Cannot install .deb packages opened from Firefox
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** Package changed: ubuntu => ubiquity (Ubuntu)
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Title:
Cannot install .deb packages opened from Firefox
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Some have reported this at https://askubuntu.com/questions/1232868
/problem-installing-deb-in-software-install-ubuntu-20-04
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Title:
Cannot
