Thanks. We will need to see more of the problem than the short extract
provided so far:

==============================journalctl_extract.txt====================================
juil. 16 21:47:45 portable-ldlc gnome-shell[1165]: Failed to apply DRM plane 
transform 0: Permission non accordée
juil. 16 21:47:47 portable-ldlc gnome-shell[1165]: WL: error in client 
communication (pid 1165)
juil. 16 21:47:47 portable-ldlc org.gnome.Shell.desktop[1165]: (EE)
juil. 16 21:47:47 portable-ldlc org.gnome.Shell.desktop[1165]: Fatal server 
error:
juil. 16 21:47:47 portable-ldlc org.gnome.Shell.desktop[1165]: (EE) wl_drm@4: 
error 0: authenicate failed
juil. 16 21:47:47 portable-ldlc org.gnome.Shell.desktop[1165]: (EE)
juil. 16 21:47:48 portable-ldlc systemd[1]: systemd-hostnamed.service: 
Succeeded.
juil. 16 21:47:50 portable-ldlc gnome-shell[1165]: X Wayland crashed; exiting
...

Please reintroduce the bug and then collect the whole log from
journalctl. If the bug has occurred during the current boot then run:

  journalctl -b0 > curboot.txt

Or if the problem occurred during the previous boot then run:

  journalctl -b-1 > prevboot.txt

and attach the resulting file.

Also, since "X Wayland crashed", please follow these instructions to
help us track that down:

https://wiki.ubuntu.com/Bugs/Responses#Missing_a_crash_report_or_having_a_.crash_attachment

** Also affects: xorg-server (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: xorg-server (Ubuntu)
       Status: New => Incomplete

** No longer affects: gdm3 (Ubuntu)

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1836805

Title:
  screen frozen after reboot

Status in xorg-server package in Ubuntu:
  Incomplete

Bug description:
  After I installed Ubuntu 19.04 (fresh install with hard drive
  erasing), I was able to login once just after install. But then after
  reboot, the screen freezes in the middle of the boot process and I
  never get the login banner.

  I was able to launch the recovery mode and get some information
  through journalctl command and it seems that the problem is related to
  a Wayland server crash. I don't really know if the problem comes from
  Wayland or Gnome. The first worrying error message is :
  "gnome_shell[1165]: Failed to apply DRM plane transform 0: Permission
  non accordée" (ie, Permission denied in french)

  Thanks to the recovery mode I was able to upgrade via "apt-get update"
  and "apt-get upgrade", but the symptoms were the same after a reboot

  I uncommented the "Enable=true" flag of the [debug] section of
  /etc/gdm3/custom.conf and I provide and extract of the journalctl
  output related to the error as an attachment to this report
  (journalctl_extract.txt part). I also provide some system information
  (system.txt pat).

  I hope this may help to solve the issue.
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.10-0ubuntu27.1
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 19.04
  InstallationDate: Installed on 2019-07-15 (2 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
  Package: gdm3 3.32.0-1ubuntu1
  PackageArchitecture: amd64
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 5.0.0-20.21-generic 5.0.8
  Tags:  disco
  Uname: Linux 5.0.0-20-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  mtime.conffile..etc.gdm3.custom.conf: 2019-07-18T07:25:10.575513

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