Public bug reported:

Dear all,

I had a problem login on Xwindows between Ubuntu 17.10 and Ubuntu 18.04.
In short after I type my login password on ubuntu I got following
behavior:
---The login screen disappear, I can see the pointer of the mouse.
   After 3-5 s I am thrown back to the login screen.
---The login screen disappear, I can see the pointer of the text input.
   I remain stuck here forever. However, I can access console windows
   by typing Ctrl-Alt F4
---The login happens normally (very rare, only 2 times).

I do not know what environment I use for login, whether it is KDE/Gnome/
LXDE/Unity, etc. Most likely it is is Unity or gnome. It used to be possible
to select the environment at runtime, but that is no longer possible.

It is not a password problem, since I can login to the shell normally.

Before this happened, I had in Ubuntu 17.10 some error messages saying that
my the screen resolution was not available or something of this kind but
I had the Xwindows environment anyway.

I tried to resolve the issue on "askubuntu", see
https://askubuntu.com/questions/1033535/cannot-login-with-upgraded-ubuntu-18-04
without success and Zanna recommended me to report the problem on launchpad.

The problem happened with the latest version of the ubuntu, i.e. after the
updates to gnome-session. The bug is a priori not related to X windows
since I have the login screen. It is after the login screen that problems
happen.

The computer is Dell Inspiron-5767.

I would be interested by ANY solution that allows me to work in graphic mode,
be it LXDE or whatever, but I do not know how to change this from the command
line. So far, I use tmux and screen and would like something better.

Thank you very much in advance for any help,

  Mathieu

PS1: Contact me on [email protected]

PS2: The latest error is the content of the .xsession-errors as recorded from 
the
     text shell after Ctrl-Alt F4:
dbus-update-activation-environment: setting 
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1001/bus
dbus-update-activation-environment: setting DISPLAY=:0
dbus-update-activation-environment: setting XAUTHORITY=/home/mathieu/.Xauthority
dbus-update-activation-environment: setting GTK_MODULES=gail:atk-bridge
dbus-update-activation-environment: setting QT_ACCESSIBILITY=1
dbus-update-activation-environment: setting QT_LINUX_ACCESSIBILITY_ALWAYS_ON=1
dbus-update-activation-environment: setting CLUTTER_IM_MODULE=xim
dbus-update-activation-environment: setting LC_MEASUREMENT=hr_HR.UTF-8
dbus-update-activation-environment: setting LC_PAPER=hr_HR.UTF-8
dbus-update-activation-environment: setting LC_MONETARY=hr_HR.UTF-8
dbus-update-activation-environment: setting LANG=en_US.UTF-8
dbus-update-activation-environment: setting GDM_LANG=en_US
dbus-update-activation-environment: setting DISPLAY=:0
dbus-update-activation-environment: setting COMPIZ_CONFIG_PROFILE=ubuntu
dbus-update-activation-environment: setting GTK2_MODULES=overlay-scrollbar
dbus-update-activation-environment: setting JAVA_HOME=/usr/lib/jvm/java-9-oracle
dbus-update-activation-environment: setting J2SDKDIR=/usr/lib/jvm/java-9-oracle
dbus-update-activation-environment: setting 
PAM_KWALLET5_LOGIN=/run/user/1001/kwallet5.socket
dbus-update-activation-environment: setting 
MANDATORY_PATH=/usr/share/gconf/ubuntu.mandatory.path
dbus-update-activation-environment: setting LC_NAME=hr_HR.UTF-8
dbus-update-activation-environment: setting 
XDG_GREETER_DATA_DIR=/var/lib/lightdm-data/mathieu
dbus-update-activation-environment: setting 
DERBY_HOME=/usr/lib/jvm/java-9-oracle/db
dbus-update-activation-environment: setting USER=mathieu
dbus-update-activation-environment: setting DESKTOP_SESSION=ubuntu
dbus-update-activation-environment: setting QT4_IM_MODULE=ibus
dbus-update-activation-environment: setting 
DEFAULTS_PATH=/usr/share/gconf/ubuntu.default.path
dbus-update-activation-environment: setting QT_QPA_PLATFORMTHEME=appmenu-qt5
dbus-update-activation-environment: setting PWD=/home/mathieu
dbus-update-activation-environment: setting HOME=/home/mathieu
dbus-update-activation-environment: setting J2REDIR=/usr/lib/jvm/java-9-oracle
dbus-update-activation-environment: setting QT_ACCESSIBILITY=1
dbus-update-activation-environment: setting XDG_SESSION_TYPE=x11
dbus-update-activation-environment: setting 
XDG_DATA_DIRS=/usr/share/ubuntu:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop
dbus-update-activation-environment: setting XDG_SESSION_DESKTOP=ubuntu
dbus-update-activation-environment: setting LC_ADDRESS=hr_HR.UTF-8
dbus-update-activation-environment: setting LC_NUMERIC=hr_HR.UTF-8
dbus-update-activation-environment: setting GTK_MODULES=gail:atk-bridge
dbus-update-activation-environment: setting SHELL=/bin/bash
dbus-update-activation-environment: setting 
XDG_SEAT_PATH=/org/freedesktop/DisplayManager/Seat0
dbus-update-activation-environment: setting QT_IM_MODULE=ibus
dbus-update-activation-environment: setting XMODIFIERS=@im=ibus
dbus-update-activation-environment: setting IM_CONFIG_PHASE=1
dbus-update-activation-environment: setting XDG_CURRENT_DESKTOP=Unity:Unity7
dbus-update-activation-environment: setting QT_LINUX_ACCESSIBILITY_ALWAYS_ON=1
dbus-update-activation-environment: setting SHLVL=1
dbus-update-activation-environment: setting LANGUAGE=en_US:
dbus-update-activation-environment: setting LC_TELEPHONE=hr_HR.UTF-8
dbus-update-activation-environment: setting GDMSESSION=ubuntu
dbus-update-activation-environment: setting LOGNAME=mathieu
dbus-update-activation-environment: setting 
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1001/bus
dbus-update-activation-environment: setting XDG_RUNTIME_DIR=/run/user/1001
dbus-update-activation-environment: setting 
PAM_KWALLET_LOGIN=/run/user/1001/kwallet.socket
dbus-update-activation-environment: setting XAUTHORITY=/home/mathieu/.Xauthority
dbus-update-activation-environment: setting 
XDG_SESSION_PATH=/org/freedesktop/DisplayManager/Session0
dbus-update-activation-environment: setting 
XDG_CONFIG_DIRS=/etc/xdg/xdg-ubuntu:/etc/xdg:/usr/share/kubuntu-default-settings/kf5-settings
dbus-update-activation-environment: setting 
PATH=/home/mathieu/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin:/usr/lib/jvm/java-9-oracle/bin:/usr/lib/jvm/java-9-oracle/db/bin
dbus-update-activation-environment: setting LC_IDENTIFICATION=hr_HR.UTF-8
dbus-update-activation-environment: setting DESKTOP_MODE=1
dbus-update-activation-environment: setting GTK_IM_MODULE=ibus
dbus-update-activation-environment: setting LC_TIME=hr_HR.UTF-8
dbus-update-activation-environment: setting 
_=/usr/bin/dbus-update-activation-environment

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1770635

Title:
  Impossibility to login on ubuntu 18.04

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