[Bug 1762127] Re: Ubuntu stuck in loop at boot after upgrade from 17.10 to 18.04

[Brian Murray]

** Also affects: xdiagnose (Ubuntu)
   Importance: Undecided
       Status: New

** Package changed: ubuntu-release-upgrader (Ubuntu) => xorg (Ubuntu)

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https://bugs.launchpad.net/bugs/1762127

Title:
  Ubuntu stuck in loop at boot after upgrade from 17.10 to 18.04

Status in xdiagnose package in Ubuntu:
  New
Status in xorg package in Ubuntu:
  New

Bug description:
  * I did a do-release-upgrade -d
  * After the upgrade was done, I rebooted

  Result:

  My computer was stuck in a boot loop, showing alternatively a black
  screen, a text log and a set of random pixels.

  Here is a GIF of the loop: https://imgur.com/zGGTzma

  As I had to make my computer work again I had to reinstal Ubuntu from
  a 18.04 live USB stick, so I'm not sure if I could get information
  from the previous installation. Reinstalling made my computer work
  fine with 18.04. I just need to reinstall all my applications.

  I had an external Mesa installation on 17.10 from Padoka Stable PPA.
  May it be related? At the moment, Mesa version from Padoka Stable is
  18.0.0~*~padoka0, whereas after a 18.04 reinstall it is 18.0.0-rc5

  Note: I tried to boot in safe mode with graphics, but it does not start, I get this error in the console:
  /usr/share/xdiagnose/failsafeXinit: line 194 : [: == : unary operator expected

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.13
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  ApportVersion: 2.20.9-0ubuntu4
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Apr  8 08:56:54 2018
  InstallationDate: Installed on 2018-04-07 (0 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180403)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: No upgrade log present (probably fresh install)

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