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


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:

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
 PATH=(custom, no user)
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: xdiagnose (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bionic dist-upgrade wayland-session
Ubuntu stuck in loop at boot after upgrade from 17.10 to 18.04
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