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

[Hadrien]

Public bug reported:

* 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)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic dist-upgrade wayland-session

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to ubuntu-release-upgrader in
Ubuntu.
https://bugs.launchpad.net/bugs/1762127

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

Status in ubuntu-release-upgrader 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)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1762127/+subscriptions