I have just re-installed twice Ubuntu because of this problem, I'm only able to see the login screen when I use recovery mode and select File System Check. In other case I just hear the start sound but I can't see anything on my screen, it still works the terminal because I can press Ctrl+Alt+F1 and reboot the system, but I can't see that on the screen, unless as I said using the recovery mode options. I'm sure it happened after the update because I had been rebooting after any install or copying a file from a USB flash drive and I wasn't seeing any problem before I updated.

I also remember that there was a package that was just downloaded 70% and it automatically changed to another package and I'm not sure it downloaded and installed correctly the package.

Before re-installing, I was not sure about the problem and I even tried configurating gdm and didn't work.


My problem is very same to your problem, and I solved it this way:.

  1. pressed Ctrl+Alt+F1
  2. sudo rm /home/<username>/.Xauthority
  3. sudo apt-get install --reinstall xorg && sudo reboot.

    In this step you may see the following packages have unmet dependencies. If you see this issue, do a: sudo apt-get clean && sudo apt-get -f install, then issue sudo apt-get install --reinstall xorg again.

  4. sudo reboot
  • It didn't work. I reinstalled it again and then I did dist-upgrade instead the updater and I got the same problem. I entered the system from recovery mode and I did what you said and it didn't change anything. – Victor Miguel García Sanchez Jul 14 '15 at 15:56
  • Do you change permissions on home directory? sudo chmod -R ug+rwx /home/[username] – Xiuyang Sun Jul 14 '15 at 16:44
  • no, do I have to do it before or after removing xauthority? – Victor Miguel García Sanchez Jul 14 '15 at 16:47
  • I recomend you to check your account's authority in home file, cd /home/[username] && ls -l. If some files are root permissions, you should change them – Xiuyang Sun Jul 15 '15 at 9:11

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