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

[Ubuntu Foundations Team Bug Bot]

** Package changed: ubuntu => ubiquity (Ubuntu)

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

Title:
  Cannot install .deb packages opened from Firefox

Status in firefox package in Ubuntu:
  New

Bug description:
  Suppose in Firefox you click a link to a .deb package. A dialog named
  "Opening [filename].deb" opens. If you select "Open with", then the
  .deb file is downloaded, placed in /tmp/mozilla_[username]0/
  directory, then Software Install (as named in the Firefox dialog) is
  started on that .deb file.

  Next, Software Install loads and fails with "Failed to install file:
  not supported".

  If on the other hand, in Firefox's "Opening [filename].deb" dialog, if
  I select "Save File" instead, the .deb file ends up in the user's
  Downloads directory. Software Install works fine with the package
  there.

  I don't want to get too much into solutioning or "why". The main point
  of this bug is that I should not get a weird error just because I
  selected "Open with" instead of "Save File". This happens with a
  vanilla install of Ubuntu, with nothing else installed, so the product
  isn't working in an intuitive way.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.10
  Package: ubiquity (not installed)
  ProcVersionSignature: Ubuntu 5.8.0-33.36-generic 5.8.17
  Uname: Linux 5.8.0-33-generic x86_64
  ApportVersion: 2.20.11-0ubuntu50.3
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Dec 16 19:54:01 2020
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
  InstallationDate: Installed on 2020-12-10 (6 days ago)
  InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubiquity
  Symptom: installer
  UpgradeStatus: No upgrade log present (probably fresh install)

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