** No longer affects: cairo (Ubuntu)

** Project changed: cairo => ubuntu-translations

** No longer affects: ubuntu-translations

** Tags removed: verification-needed

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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 OEM Priority Project:
  Fix Released
Status in ubiquity package in Ubuntu:
  Fix Released
Status in ubiquity source package in Bionic:
  Fix Released

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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