apport-gtk crashed with ValueError in _apt_pkg(): package rhythmbox-ubuntuone-music-store does not exist

Part of the issue here is the rhythmbox apport source package hook which contains the following:

    # Check to see if the stacktrace is a webkit or libubuntuone issue
    # if it is, then reassign to the Ubuntu One Music Store
    stacktrace = report.get("Stacktrace", None)
    if stacktrace:
        if "ubuntuone" in stacktrace or "webkit" in stacktrace:
            report.add_package_info("rhythmbox-ubuntuone-music-store")
            return

However, apport shouldn't crash if the package doesn't exist. I'll open a rhythmbox task for fixing the source package hook.

Status changed to 'Confirmed' because the bug affects multiple users.

I was directed here when reporting, but in my case, it was with Skype, not Rhythmbox:

 Traceback (most recent call last):
   File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 113, in _apt_pkg
     return self._cache()[package]
   File "/usr/lib/python3/dist-packages/apt/cache.py", line 185, in __getitem__
     raise KeyError('The cache has no package named %r' % key)
 KeyError: "The cache has no package named 'skype-bin'"

That's because the rhythmbox hook calls report.add_package_info() instead of attach_related_packages(). add_package_info() sets the report's Package: field, which is really the wrong thing to do here.

I'll fix the rhythmbox hook, and install it again (it got dropped from the last merge in trusty).

This bug was fixed in the package rhythmbox - 3.0.1-1ubuntu3

---------------
rhythmbox (3.0.1-1ubuntu3) trusty; urgency=low

  * debian/source_rhythmbox.py: Fix rhythmbox-ubuntuone package name, and
    don't call add_package_info() on it if it isn't installed. (LP: #1055464)
  * debian/rhythmbox-data.install: Install the Apport hook again (got dropped
    during merge).
 -- Martin Pitt <email address hidden> Tue, 05 Nov 2013 11:07:26 +0100

This also affects Ubuntu 14.04 Trusty Tahr (Development Release).