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[Launchpad Bug Tracker <1751252@xxxxxxxxxxxxxxxxxx>]

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* 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:

** Affects: ubuntu-translations
     Importance: Medium
         Status: Unknown

** Affects: oem-priority
     Importance: Critical
         Status: Fix Released

** Affects: ubiquity (Ubuntu)
     Importance: High
     Assignee: Andrea Azzarone (azzar1)
         Status: Fix Released

** Affects: ubiquity (Ubuntu Bionic)
     Importance: High
     Assignee: Andrea Azzarone (azzar1)
         Status: Fix Released


** Tags: amd64 apport-crash bionic id-5a9829e833b1e20a0cfd336c iso-testing ubiquity-18.04.1 ubuntu verification-done-bionic verification-needed
-- 
[regression] ubiquity crashed in debconf.py:104 with ValueError: invalid literal for int() with base 10: ''
https://bugs.launchpad.net/bugs/1751252
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