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I tried almost everything to resolve the login loop problem. But it doesn't work.

chown .Xautority and /tmp is okay, dpkg-reconfigure lightdm doesn't work.

One of my clues is that I can see --user not found error in .xsession-errors file when I log in tty (Ctrl+Alt+F3).

Can anyone help me resolve this?

It still has a problem. I attached the screen .xsession-error.

It can have typo since I changed the screen picture to text.

systemd --user not found, ignoring --systemd argument
setting DISPLAY=:1
emphasized textsetting XAUTHORITY=//.Xauthority
systemd --user not found, ignoring --systemd argument 
setting GTK_MODULES=gail:atk-bridge
systemd --user not found, ignoring --systemd argument 
setting QT_ACCESSIBILITY=1
systemd --user not found, ignoring --systemd argument 
setting SUDO_GID=1000
setting MAIL=/var/mailiroot
setting USER=root
setting LANGUAGE=en_US:
setting LC_TIME=ko_KR.UTF-8
setting SHLVL=1
setting HOME=/
setting OLDPWD=/
setting GTK_MODULES=gail:atk-bridge
setting LC_MONETARY=ko_KR.UTF-8
setting DBUS_SESSION_BUS_ADDRESS=unix:abstract=Stmp/dbus-5g9m8q6Iuw,guid=c36 
setting SUDO_UID=1000
sett ing IM_CONFIG_PHASE=1
sett ing LOGNAME=root
setting _=/usr/bin/startx
setting USERNAME=root
setting TERM=linux
setting WINDONPATH=3
setting PATH=/usr/local/sbin:/usr/local/bin:,usr/sbin:/usr/bin:/sbin:/bin
setting LC_ADDRESS=Ko_KR.UTF-8
setting DISPLAY=:1
setting LANG=en_US.UTF-8
setting LC_TELEPHONE=ko_KR.UTF-8
setting XAUTHORITY=//.Xauthority
setting SUDO_COMMAND=/bin/bash
setting LC_NAHE=ko_KR.U17-8
setting SHELL=/bin/bash
setting QTACCESSIBILITY=1
setting SUDO_USER=kzi
setting LC_MEASUREMENTIgkO_KR.UTP•11
sett ing LC_IDENTIF ICATION=MLICR UTP•••
setting GPG_AGENT_INFO=//.gnupg/S.gpg-agent:0:1
setting JAVA_HOME=/usr/lib/jvm/java-8-oracle 
etting PWP=/home
setting XDG_DATA_DIRS=/usr/share/gnome:/usr/local/share/:/usr/share
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  • 1
    Did you make a change in the session (or two) before you had the login loop? Have you checked you have space in $HOME (your user directory; as if the GUI cannot create work files needed for your desktop, login fails & you are logged out without message). I don't see what dpkg-reconfigure lightdm would do, as 18.04 uses gdm3 by default & why did you want to re-run the post-install script for lightdm? What made you think it was involved? ie. background for your issue can be useful.
    – guiverc
    Commented Sep 3, 2019 at 9:53
  • Please also post a larger fragment of your .xsession-errors file so we can see the messages in context
    – steeldriver
    Commented Sep 3, 2019 at 13:48
  • Thanks for the response. It's all of sudden. It just repeats the login loop. So I login by tty to see error log and the below is in .xsession-error. As you expected, there is no $USER directory in /home.
    – Zeung-il Kim
    Commented Sep 5, 2019 at 2:09

1 Answer 1

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You can solve this thing by following steps:

  1. Press Ctrl+Alt+F2 then enter your username and password.

  2. sudo apt -f install

  3. sudo dpkg --configure -a

  4. sudo dpkg-reconfigure lightdm

  5. sudo dpkg-reconfigure gdm

  6. sudo dpkg-reconfigure gdm3

  7. sudo mv .Xauthority .Xauthority.bak

  8. sudo reboot

  9. Press Ctrl+Alt+F2 then enter your username and password.

  10. sudo apt update

  11. sudo apt upgrade

  12. sudo reboot

  13. Press Ctrl+Alt+F2 then enter your username and password.

  14. sudo dpkg --configure -a

  15. sudo apt -f install

  16. sudo reboot

After all these steps, if you are still facing the problem, post the errors and error logs you see.

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