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While running ubuntu 18.04, I was running out of ram. So I decided to end some programs from the system monitor. But I ended some essential service then blank screen appears. I rebooted the system and it led me to tty. For those who don`t know, tty stands for Teletype. It is basically a non-graphical version of the whole system. I can still login and access the terminal but no GUI.

NOT MY PC. Got the image from google

Before , I got an error of pkcs#7 signature not signed with a trusted key. I ran dpkg--Repair broken packages (something I have found on forums) from recovery mode. But the error was not solved. Only the above stated line was gone.

Edit:- After a lot of searching, I tried to reinstall gdm3 and it solved the error. You can check my answer below.

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  • Have you tried ctrl+alt+f1 or any of the function buttons?
    – Martin Maeland
    May 11, 2021 at 12:07
  • Hit Ctrl + Alt + F7 and see if it loads the GUI.
    – Daniel
    May 11, 2021 at 14:10
  • Terminating GDM seems unrelated to package errors. Seems like there is more going on than the question describes, which makes it unlikely to help future searchers.
    – user535733
    May 11, 2021 at 15:48
  • I have solved the error. I reinstalled gdm3 and everything was back on. If you say so, I would edit the question and explain in detail.
    – Master_Nachi
    May 11, 2021 at 18:46

1 Answer 1

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I found the solution. I reinstalled and reconfigured gdm3 and it automatically started. Reinstall gdm3:- sudo apt-get install --reinstall gdm3
sudo dpkg-reconfigure gdm

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