After the restart step of upgrading Ubuntu to 18.04, tty is opening instead ubuntu-desktop. And when I enter my login name and password, I am still in the tty. This is happening again in every restart. How can I start the graphical desktop as normal?

  • Does it work if you press Ctrl+Alt+F7? – Olimjon May 4 '18 at 12:12
  • It is not exited by pressing Ctrl+Alt+F7. – dildeolupbiten May 4 '18 at 12:14
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    Which desktop environment are you selecting from the gear drop down menu next to the Sifn In button? The first four options don't work for me. Only the bottom option (Unity) works for me. – WinEunuuchs2Unix May 4 '18 at 12:16
  • I didn't see any options. – dildeolupbiten May 4 '18 at 12:18

Try logging in to your default desktop environment from the tty virtual console.

  1. Open a text-only virtual console by using the keyboard shortcut Ctrl+Alt+F3.

  2. At the login: prompt type your username and press Enter.

  3. At the Password: prompt type your user password and press Enter.

  4. Now you are logged in to a virtual console, and you can run terminal commands from the console.

Run the following command:

sudo systemctl start graphical.target

If that doesn't work, switch the login display manager from gdm3 to lightdm.

sudo apt install lightdm  
sudo dpkg-reconfigure lightdm   
sudo reboot  

sudo dpkg-reconfigure lightdm will open up a new window allowing you to select lightdm as the default login display manager. Use the arrow keys to select lightdm and press the Tab key to put the focus on <OK> and press Enter. Then reboot by running this command: sudo reboot

If that doesn't work either see if you can at least switch to text mode (for troubleshooting purposes) with no GUI stuff like the X server running.

sudo systemctl start multi-user.target  
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  • sudo systemctl start graphical.target doesn't work. Also after sudo dpkg-reconfigure lightdm nothing happened but a message was printed to the console. The message was /usr/sbin/dpkg-reconfigure: lightdm is corrupt or not fully installed. – dildeolupbiten May 4 '18 at 12:35
  • I didn't see your edited message which is about installing lightdm. I am going to try this immediately. – dildeolupbiten May 4 '18 at 12:38
  • If your lock screen goes low resolution (because of lightdm), please comment and I'll tell you how to restore the lock screen back to normal. The keyboard combination of Windows key+L may work for that better than clicking the padlock lockscreen icon. – karel May 4 '18 at 12:53
  • Thank you very much. But the resolution of lock screen is fine as before. – dildeolupbiten May 4 '18 at 20:47
  • I had the same problem, and followed the instructions on this answer. But now, when I try to log in with lightdm, all I get is "login failed". Any ideas? – machetazo Aug 27 '18 at 14:02

The commands below solved the problem on my PC:

sudo apt install lightdm  
sudo dpkg-reconfigure lightdm   
sudo reboot
sudo apt-get install compizconfig-settings-manager
DISPLAY=:0 ccsm &
sudo apt-get upgrade 
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