[Bug 1780501] Re: Traceback calling Vte.Terminal.feed_child()

[Iain Lane]

OK.

For the record, it's not an assumption. Catching TypeError is a way to
deal with the fact that there were two versions of this function around.
The version of Vte in bionic, because of the MIR team's refusal to let
us have PCRE 2 in main, accidentally had an API break relative to the
same version released upstream. If you wanted your code to work with the
same upstream version of Vte on Ubuntu and non-Ubuntu you had to deal
with this.

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https://bugs.launchpad.net/bugs/1780501

Title:
  Traceback calling Vte.Terminal.feed_child()

Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged
Status in vte2.91 package in Ubuntu:
  Won't Fix
Status in ubuntu-release-upgrader source package in Bionic:
  Invalid
Status in vte2.91 source package in Bionic:
  Triaged

Bug description:
  I was upgrading from Bionic to Cosmic when I received a conffile
  prompt regarding /etc/update-initramfs/initramfs.conf, I clicked keep
  and then saw this Traceback:

  Original exception was:
  Traceback (most recent call last):
    File "/tmp/ubuntu-release-upgrader-filpk342/cosmic", line 8, in <module>
      sys.exit(main())
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeMain.py", line 238, in main
      if app.run():
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeController.py", line 1949, in run
      return self.fullUpgrade()
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeController.py", line 1912, in fullUpgrade
      if not self.doDistUpgrade():
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeController.py", line 1248, in doDistUpgrade
      res = self.cache.commit(fprogress,iprogress)
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeCache.py", line 293, in commit
      apt.Cache.commit(self, fprogress, iprogress)
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 606, in commit
      pm = apt_pkg.PackageManager(self._depcache)
    File "/usr/lib/python3/dist-packages/apt/cache.py", line 569, in install_archives
      # compat with older API
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeView.py", line 229, in run
      res = os.WEXITSTATUS(self.wait_child())
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeViewGtk3.py", line 340, in wait_child
      self.update_interface()
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeViewGtk3.py", line 347, in update_interface
      InstallProgress.update_interface(self)
    File "/usr/lib/python3/dist-packages/apt/progress/base.py", line 252, in update_interface
      if err.errno != errno.EAGAIN and err.errno != errno.EWOULDBLOCK:
    File "/tmp/ubuntu-release-upgrader-filpk342/DistUpgrade/DistUpgradeViewGtk3.py", line 276, in conffile
      self.term.feed_child("n\n", -1)
  TypeError: Vte.Terminal.feed_child() takes exactly 2 arguments (3 given)

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