[Bug 1448592] Re: upgrade from 14.10 to 15.04 stuck

[Chelmite]

I'm not sure which package to file against. I've used Linux for years.
How do I identify a package when it's run from some GUI package? I was
running Software Updater. It spawned something to upgrade from 14.10 to
15.04, but it doesn't identify itself w.r.t. package... The window
banner says "ROOT: Distribution Upgrade". Should the bug be filed
against 'ROOT: Distribution Upgrade'? If so, what's the package name?
Should the bug be filed against libgutenprint2 (amd64), which is the
last item in the progress log? Should the bug be filed against insserv
or virtualbox, which are the last items in the console log in the 'ROOT:
Distribution Upgrade' window?

** Package changed: ubuntu => ubuntu-release-upgrader (Ubuntu)

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https://bugs.launchpad.net/bugs/1448592

Title:
  upgrade from 14.10 to 15.04 stuck

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  When I got the daily popup from the Software Updater that said new
  updates are available, I reviewed the updates (nothing major), said
  okay, and it installed a few things. At the end it said that 15.04 was
  available. I said okay, and it spent hours downloading lots of things.
  At around midnight the status window seemed to be stuck "Configuring
  libgutenprint2 (amd64)". The next morning it looked like no progress
  had been made. There don't seem to be any hidden or minimized windows,
  so I don't know what it's waiting for.

  Here is the (truncated) installation log:

      Preparing to unpack .../sndfile-programs_1.0.25-9.1_amd64.deb ...
      Unpacking sndfile-programs (1.0.25-9.1) over (1.0.25-9) ...
      ...<snip>
      Setting up openssl (1.0.1f-1ubuntu11) ...
      Setting up ssl-cert (1.0.35) ...
      GdkPixbuf-WARNING **: Cannot open pixbuf loader module file '/usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache': No such file or directory
      
      This likely means that your installation is broken.
      Try running the command
        gdk-pixbuf-query-loaders > /usr/lib/x86_64-linux-gnu/gdk-pixbuf-2.0/2.10.0/loaders.cache
      to make things work again for the time being. at /usr/share/perl5/Debconf/FrontEnd/Gnome.pm line 148.
      Gtk-WARNING **: Error loading theme icon 'window-close' for stock: Unrecognized image file format at /usr/share/perl5/Debconf/FrontEnd/Gnome.pm line 148.
      Setting up cups-daemon (2.0.2-1ubuntu3) ...
      Installing new version of config file /etc/apparmor.d/usr.sbin.cupsd ...
      Installing new version of config file /etc/cups/cups-files.conf ...
      insserv: warning: script 'K02showfsck' missing LSB tags and overrides
      insserv: warning: script 'showfsck' missing LSB tags and overrides
      insserv: script virtualbox: service vboxdrv already provided!
      insserv: script virtualbox: service virtualbox already provided!

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