[Bug 1999308] Re: Snap keeps uninstalling apt Firefox, and reinstalling snap Firefox

[herrsaalfeld]

If you intercept snap as described above by

   sudo snap disable firefox
   sudo snap remove firefox

and add the Mozilla PPA for Firefox, then the Ubuntu deb package will
remove the Mozilla Firefox version without being able to install the
snap version because that was disabled.  The result is no Firefox.  This
can be fixed by running apt upgrade twice but I would call this a bug
with the package.

This can be prevented by disabling the Ubuntu package by

cat <<EOF | sudo tee /etc/apt/preferences.d/mozilla-firefox
Package: firefox*
Pin: release o=Ubuntu*
Pin-Priority: -1
EOF

but I would have hoped that the package would refrain from deinstalling
without replacing.  The transitional package must make sure that calling
snap will result in the expected package being installed before removing
the 'old' version.  If that isn't something that can be done with
'transitional' packages in apt, then I would argue that releasing such
transitional deb packages should not be done.

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Title:
  Snap keeps uninstalling apt Firefox, and reinstalling snap Firefox

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