My system (information provided by inxi -Fxxxr | pastebin (I can't remember for sure how many "x" and other letters) https://gist.github.com/anonymous/4f3dd ... c8876b6249
After I stopped the lightdm service from terminal session and rebooted my PC, appeared the Login screen on which I am entering the password without errors but it returns me back into Login screen. I am able to use Guest (from Login screen) and any Terminal session (Ctlr+Alt+F1 or F2, etc.).
One of errors I have got on the terminal while I was trying to start the GUI with "startx" command was:
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system-ligind [2427]: Failed to start user service, ignoring: Unknown unit user@1000.service
Is there something I should try before I make a new installation? I haven't found nothing helpful here, on other forums I have seen similar issue for Arch.
Sorry for your time and thank you in advance for any answer.
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My quick solution (worked for me):
I installed mdm
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sudo apt-get install mdm
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sudo dpkg-reconfigure mdm
In other cases it could be useful to read (in case my way haven's solved this) this - lighghtdm - Ubuntu gets stuck in a login loop (same login loop as mine).
It is some weird bug or error of lightdm after using sudo with startx command...