An upload of ubiquity to bionic-proposed has been rejected from the
upload queue for the following reason: "All looks good with the package
itself, but sadly there seems to be some leftover .gladep file included
with the changes. Could you reupload without it? Or, if it's needed,
just mention that in the bug? Thank you!".

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https://bugs.launchpad.net/bugs/1751252

Title:
  [regression] ubiquity crashed in debconf.py:104 with ValueError:
  invalid literal for int() with base 10: ''

Status in cairo:
  Confirmed
Status in OEM Priority Project:
  Triaged
Status in cairo package in Ubuntu:
  In Progress
Status in ubiquity package in Ubuntu:
  In Progress
Status in cairo source package in Bionic:
  In Progress
Status in ubiquity source package in Bionic:
  In Progress

Bug description:
  * Impact
  The Ubuntu installer crashes on some machines (seems more often on hiDPI 
machines (QHD/UHD etc)).

  * Test case
  Try installing Ubuntu on an hidpi machine, it should complete installation 
instead of crashing.

  * Regression potential
  The fix in ubiquity touches the code handle uid drop/privilege, that can have 
unexpected side effects so we need proper/complete testing of the installer

  ----------

  Update: Actually the crash occurs on slow-ish systems due to a race
  condition. It's not strictly only hi-DPI machines - that's just the
  most common place it is experienced.

  ---

  https://errors.ubuntu.com/problem/82f7f7e7923663c7b2123c7f1f49af29f6ff4d77
  https://errors.ubuntu.com/problem/735a2b847e0eeab6c8a7b954de5110e43889be15
  https://errors.ubuntu.com/problem/dcd4c9da5ee0cc6d36324446e0e49d39705c90b7
  https://errors.ubuntu.com/problem/cb82f70f9ede07369e8104da9ddf87e28b42257d
  https://errors.ubuntu.com/problem/84a5563af3d2b85f098da832ece4cb8450bfd524

  ---

  WORKAROUND:

  1. Boot into the live session.
  2. Settings > Devices > Displays > Scale = 100%
  3. Click Apply.
  4. Proceed with installation: Click "Install Ubuntu 18.04 LTS".

  ---

  Crashed in a VM in the middle of installation. The host is Bionic up
  to date.

  From the journal
  Feb 23 12:52:27 ubuntu kernel: traps: ubiquity[2646] trap int3 
ip:7f5a76936961 sp:7ffde5090c50 error:0 in 
libglib-2.0.so.0.5400.1[7f5a768e6000+111000]
  Feb 23 12:52:41 ubuntu /install.py[6858]: Exception during installation:
  Feb 23 12:52:41 ubuntu /install.py[6858]: Traceback (most recent call last):
  Feb 23 12:52:41 ubuntu /install.py[6858]:   File 
"/usr/share/ubiquity/install.py", line 757, in <module>
  Feb 23 12:52:41 ubuntu /install.py[6858]:     install.run()
  Feb 23 12:52:41 ubuntu /install.py[6858]:   File 
"/usr/share/ubiquity/install.py", line 135, in run
  Feb 23 12:52:41 ubuntu /install.py[6858]:     self.copy_all()
  Feb 23 12:52:41 ubuntu /install.py[6858]:   File 
"/usr/share/ubiquity/install.py", line 505, in copy_all
  Feb 23 12:52:41 ubuntu /install.py[6858]:     self.db.progress('SET', 10 + 
copy_progress)
  Feb 23 12:52:41 ubuntu /install.py[6858]:   File 
"/usr/lib/python3/dist-packages/debconf.py", line 83, in <lambda>
  Feb 23 12:52:41 ubuntu /install.py[6858]:     lambda *args, **kw: 
self.command(command, *args, **kw))
  Feb 23 12:52:41 ubuntu /install.py[6858]:   File 
"/usr/lib/python3/dist-packages/debconf.py", line 104, in command
  Feb 23 12:52:41 ubuntu /install.py[6858]:     status = int(status)
  Feb 23 12:52:41 ubuntu /install.py[6858]: ValueError: invalid literal for 
int() with base 10: ''

  ProblemType: Crash
  DistroRelease: Ubuntu 18.04
  Package: ubiquity 18.04.1
  ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  CasperVersion: 1.388
  Date: Fri Feb 23 12:52:28 2018
  ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
  InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper 
initrd=/casper/initrd.lz quiet splash --- keyboard-configuration/layoutcode=fr 
keyboard-configuration/variantcode=oss
  InterpreterPath: /usr/bin/python3.6
  LiveMediaBuild: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180222)
  ProcCmdline: /usr/bin/python3 /usr/lib/ubiquity/bin/ubiquity -d
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=C.UTF-8
   SHELL=/bin/bash
  Python3Details: /usr/bin/python3.6, Python 3.6.4+, python3-minimal, 3.6.4-1
  PythonDetails: /usr/bin/python2.7, Python 2.7.14+, python-minimal, 2.7.14-4
  Signal: 5
  SourcePackage: ubiquity
  StacktraceTop:
   ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
   ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
   _XEventsQueued () from /usr/lib/x86_64-linux-gnu/libX11.so.6
   XPending () from /usr/lib/x86_64-linux-gnu/libX11.so.6
   ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
  Title: ubiquity crashed with signal 5 in _XEventsQueued()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

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