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I just had this problem ten minutes ago and after looking to /var/log/Xorg.0.log I found out that it's a Nvidia problem (there was a line saying Xlib: extension "GLX" missing on display ":0). I realized I have Nvidia drivers from official website which are nor really stable and tested (so I've read and also experienced before). The solution here was to ...


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I got the login loop in connection with an update from Ubuntu 12.04 to 14.04. With gdm I had error messages in ~/.cache/gdm/session.log with entries such as /etc/gdm/Xsession: line 33: mktemp: command not found and after sudo aptitude purge gdm with lightdm I got several similar error messages in ~/.xsession-errors, e.g., usr/sbin/lightdm-session: line 24: ...


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Boot from a live USB/DVD, Choose the "Try Ubuntu" option Open your hard disk using the GUI and note the UID Open a terminal by pressing Ctrl+Alt+T Create a directory tmp by: cd /media/ubuntu/UID sudo mkdir tmp Set the correct permissions: sudo chmod a+rwx From now on, start making back-ups, because this would have been a no-brainer if you had a system ...


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Create new user from TTY and reboot your system, then login from new user, I had the same problem and I solve this on that way. If you are new and don't know what is TTY and how to recreate an user only comment and I'll answer your questions.


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For me this problem occurred after upgrading from "Ubuntu 12.04 LTS" plus TDE to "Ubuntu 14.04 LTS" plus TDE. TDE is the trinity desktop environment (trinitydesktop.org). The cause of the error was that /etc/X11/default-display-manager pointed to lightdm although during the upgrade I told it to use tdm-trinity as default. lightdm was broken (and I don't ...


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Today I (apparently) experienced the same problem using a system administrator UID. I tried logging in with a non-admin UID on the console. Success. I remotely logged in with the admin UID and this was my session: Last login: Fri Jul 3 16:55:22 2015 /usr/bin/xauth: /home/kingb/.Xauthority not writable, changes will be ignored kingb@North40:~$ ls -l ...



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