This has been going on for at least 6 years now!  Even though I am not a
Ubuntu man (for historical reasons I am on OpenSuse), it is highly
relevant to me, because after the latest OS upgrade, my time-honoured
Acrobat Reader 9 (Linux version!) can finally not run any more.  So I
installed the snap "acrordrdc", which runs a more modern version of the
Reader.

But, the restrictions discussed here leave an Acrobat Reader under snapd
almost entirely useless:  when trying to open a PDF file from inside a
browser (e.g. Firefox) or a mail program (e.g. Thunderbird), that
application will download the file into the /tmp hierarchy and then call
the default application for .pdf with that path as an argument.

Which, of course, won't work if I set my snap-based Reader as the
default!  And loop-back mounting /tmp somewhere in the home directory
does not help either, because the pathname passed on to the Reader will
still start with /tmp.

I am now working on a work-around wrapper, but that will be a kludge,
not a solution.

The whole issue also raises the silly question: what is so security-
sensitive about /tmp?

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https://bugs.launchpad.net/bugs/1643706

Title:
  snap apps need to be able to browse outside of user $HOME dir. for
  Desktop installs

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