no graphical login screen after boot into Ubuntu

by Tiendung   Last Updated August 14, 2019 03:02 AM - source

I'm using Lubuntu 18.04.3 LTS dual boot with Windows 10.

In the past, there were some problems about display with graphic driver and I did completely solve them so everything was working fine until last week. After running

sudo apt-get install update
sudo apt-get install upgrade

I noticed that there a new generic header at booting 4.15.0-55-generic along with the old one: 4.15.0-54-generic. However, every time I boot into this new header, I can't get into the graphical login. It only shows a cursor (sometimes blinking, sometimes not) and sometimes I can use Ctrl+Alt+Fx to switch to non-graphical login, sometimes I can't (I have to hold power button to force shutdown in this case).

When select other option, I tried boot into the old header and things are going strange: sometimes I can get into graphical login, sometimes I can't (but I can always use Ctrl+Alt+Fx to login in this case). But now I no longer can get into graphical screen.

What I have tried:

  1. follow this answer https://askubuntu.com/a/542490/930755, I see that my greeter is lightdm-gtk-greeter by default (there is only this) and everything were set as he mentioned, except that I have not installed ubuntu-desktop (I think I have nothing to do with this since my laptop was working fine without it).
  2. follow this answer https://askubuntu.com/a/162076/930755, nothing changes. There is no cursor, only black screen but I can use Ctrl+Alt+Fx.
  3. reinstall nvidia-390. My driver was it, I think I just need to reinstall the driver to solve all the conflicts (in case there are conflicts) but nothing changes.
  4. follow this answer https://askubuntu.com/a/532296/930755, after running sudo nvidia-xconfig, it said that xorg.conf has been added, but it also showed a message: package xorg-server not found. And nothing changes.
  5. login to non-graphical screen, run sudo service lightdm restart and it shows (spaces are intentionally added as it showed me so):
[ OK ] Created slice User Slice of lightdm
                   Starting User Manager for UID 106
                                  [ OK ] Started Session c1 for user lightdm
                                                   [ OK ] Started User Manager for UID 106 _

I see a cursor at the end. I think this is output in graphical screen (?). Since when I do Ctrl+Alt+`Fx, x=1 for instance, I get the previous login (where I type name and password, the messages disappeared)


I noticed this: when I do Ctrl+Alt+Fx (for x from 1 to 6) I can switch to 6 different screens and when x = 7, the screen does not switch, cursor disappears (Maybe something prevents it from switching to graphical screen ?)

I would be grateful if someone can help me solve this issue, since the last thing I think would solve it is to reinstall Lubuntu (which I don't want). Thank you in advance.



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