[Bug 1900265] Re: do-release-upgrade freezes

[uranium]

OK, this problem is elsewhere.  I started trying to upgrade because I
was getting lockups on suspend as of having taken some updates--probably
the wrong reaction, if e.g. a newer kernel is the problem.  While
debugging this upgrade problem, I also found lots of other ways to lock
up my system [running lspci -k, starting the settings app, ...].  I've
just tried booting into an older kernel [4.15.0-112 instead of
4.15.0-121] and suddenly everything works.  Release notes show up, the
upgrade seems happy to run.  I haven't done the upgrade yet--might want
to try a live-thumbdrive of the newer version to see if the kernel
problem's there or not.  But it's not the updater.

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https://bugs.launchpad.net/bugs/1900265

Title:
  do-release-upgrade freezes

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

Bug description:
  I'm trying to upgrade from Bionic to Fossa; I've had several problems
  with do-release-upgrade that may all stem from the same issue.

  I run "sudo update-manager" at the command line.

  The system alerts me of a potential upgrade: "The software on this
  computer is up to date. However, Ubuntu 20.04.1 LTS is now available
  (you have 18.04)."

  I click "Upgrade..."

  I pops up the release notes window, but never populates it; it stays
  empty, but otherwise correctly drawn, offering "Cancel" and "Upgrade".

  In the command-line window is:

  ----------------------------------------
  uranium at Hex:~$ sudo update-manager
  [sudo] password for uranium: 
  Checking for a new Ubuntu release
  /usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcher.py:23: PyGIWarning: Gtk was imported without specifying a version first. Use gi.require_version('Gtk', '3.0') before import to ensure that the right version gets loaded.
    from gi.repository import Gtk, Gdk
  /usr/lib/python3/dist-packages/DistUpgrade/ReleaseNotesViewerWebkit.py:33: PyGIWarning: WebKit2 was imported without specifying a version first. Use gi.require_version('WebKit2', '4.0') before import to ensure that the right version gets loaded.
    from gi.repository import WebKit2 as WebKit
  Gtk-Message: 09:10:22.336: GtkDialog mapped without a transient parent. This is discouraged.
  ----------------------------------------

  If I accept the upgrade anyway, despite that, it pops up another
  window that appears to run do-release-upgrade and say it's downloading
  something, before vanishing and being replace by one with the title
  "Distribution Upgrade".  That one doesn't draw properly--other than
  the title bar, it's blank, and just grabs whatever's behind it, or
  whatever was on a different desktop if I flip back and forth.  On the
  command line is:

  ----------------------------------------
  authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg' 
  extracting 'focal.tar.gz'
  ----------------------------------------

  It never gets any further.  If I click the close box, it hangs.
  Eventually Metacity offers to kill it, which I accept.  Nothing
  happens in the command line when I do.  Eventually I control-C it, and
  get this:

  ^CTraceback (most recent call last):
    File "/tmp/ubuntu-release-upgrader-mv88pmez/focal", line 8, in <module>
      sys.exit(main())
    File "/tmp/ubuntu-release-upgrader-mv88pmez/DistUpgrade/DistUpgradeMain.py", line 235, in main
      save_system_state(logdir)
    File "/tmp/ubuntu-release-upgrader-mv88pmez/DistUpgrade/DistUpgradeMain.py", line 134, in save_system_state
      universal_newlines=True).communicate()[0]
    File "/usr/lib/python3.6/subprocess.py", line 850, in communicate
      stdout = self.stdout.read()
  KeyboardInterrupt

  If instead I try to initiate the upgrade myself with do-release-
  upgrade, I get this:

  ----------------------------------------
  uranium at Hex:~$ sudo do-release-upgrade --allow-third-party 
  Checking for a new Ubuntu release
  Get:1 Upgrade tool signature [1,554 B]                                         
  Get:2 Upgrade tool [1,336 kB]                                                  
  Fetched 1,338 kB in 0s (0 B/s)                                                 
  authenticate 'focal.tar.gz' against 'focal.tar.gz.gpg' 
  extracting 'focal.tar.gz'

  Reading cache
  ----------------------------------------

  And then it never gets any further.
  Ctrl-c gives me this:

  ----------------------------------------
  ^C
  Traceback (most recent call last):
    File "/tmp/ubuntu-release-upgrader-0gokn788/focal", line 8, in <module>
      sys.exit(main())
    File "/tmp/ubuntu-release-upgrader-0gokn788/DistUpgrade/DistUpgradeMain.py", line 235, in main
      save_system_state(logdir)
    File "/tmp/ubuntu-release-upgrader-0gokn788/DistUpgrade/DistUpgradeMain.py", line 134, in save_system_state
      universal_newlines=True).communicate()[0]
    File "/usr/lib/python3.6/subprocess.py", line 850, in communicate
      stdout = self.stdout.read()
  KeyboardInterrupt
  ----------------------------------------

  More info:

  uranium at Hex:~$ lsb_release -rd
  Description:	Ubuntu 18.04.5 LTS
  Release:	18.04
  uranium at Hex:~$ apt-cache policy update-manager
  update-manager:
    Installed: 1:18.04.11.13
    Candidate: 1:18.04.11.13
    Version table:
   *** 1:18.04.11.13 500
          500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          500 http://us.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages
          100 /var/lib/dpkg/status
       1:18.04.11 500
          500 http://us.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          500 http://us.archive.ubuntu.com/ubuntu bionic/main i386 Packages
  uranium at Hex:~$ apt-cache policy do-release-upgrade
  N: Unable to locate package do-release-upgrade

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