python3-distupgrade contains symlink to externally owned directory

[Barry Warsaw]

python3-distupgrade contains the symlink /usr/lib/python3/dist-packages/DistUpgrade/NvidiaDetector which symlinks to ../NvidiaDetector. However /usr/lib/python3/dist-packages/NvidiaDetector is owned by ubuntu-drivers-common.

This causes a problem with at least the pex DEP-8 tests because in autopkgtest.ubuntu.com (and clean adt qemu images), python3-distupgrade is installed but not ubuntu-drivers-common. Thus when pex invokes pkg_resources' get_resource_stream() you get a FileNotFound exception on the former, i.e. dead, symlink.

Maybe python3-distupgrade should Depend on ubuntu-drivers-common, or maybe the symlink itself should be owned by the latter package. I don't think the former should just leave a dangling symlink on the system.

[Barry Warsaw (barry)]

For example: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-wily/wily/i386/p/python-pex/20150814_061119@/log.gz

[Launchpad Janitor (janitor)]

This bug was fixed in the package ubuntu-release-upgrader - 1:16.04.1

---------------
ubuntu-release-upgrader (1:16.04.1) xenial; urgency=medium

  [ Barry Warsaw ]
  * Don't try to import janitor and NvidiaDetector in a package relative
    to this one, to avoid the possibility of dangling symlinks when the
    packages actually containing these modules is not installed.
    (LP: #1485093)
  * debian/python3-distupgrade.links: Removed.

  [ Brian Murray ]
  * DistUpgrade/{EOL,}ReleaseAnnouncement,
    DistUpgrade/DistUpgrade/window_main.ui,
    data/gtkbuilder/DistUpgrade.ui,
    data/DistUpgrade.cfg,
    data/DistUpgrade.cfg.trusty,
    pre-build.sh:
    - updated for 15.10->16.04
  * DistUpgrade/DistUpgradeQuirks.py: add in a quirk to ensure that a linux
    metapackage is installed after the release upgrade. (LP: #1509305)

  [ Michael Vogt ]
  * DistUpgrade/DistUpgradeQuirks.py: improve linux metapackage check and add
    a test for it.

 -- Brian Murray <email address hidden> Tue, 27 Oct 2015 13:45:19 -0700