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After trying to install a new driver for my graphics card GeForce MX250 from the official Nvidia website (which was working until I turned my computer off), I can't get my computer to start anymore. After accessing the login screen and login in to my user account, the screen turns black.

I've read that I should remove the new driver and install one of the official package manager, but I just can't open a terminal so I'm somewhat lost.

I tried every possible combination of Ctrl+alt+F1-F12. But no terminal is appearing. I can't get out of the GUI. It's either that or a blank screen.

I also tried to access some kind of terminal from the gnu grub version 2.02 page which I can access during booting. I'm sorry, I don't really know if this is supposed to work anyway, but as possible boot options, I only got Ubuntu, which brought me back to the login screen.

I really hope someone can help me!

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So I finally managed to solve my problem. I could get into recovery mode by pressing Esc while starting my computer. I landed in the wrong menu because of pressing it too often, so just pressing it very slowly solved this. From the grub menu I started recovery mode. Then I chose options grub and network to be able to use the Internet. Then I started a root shell session. Afterwards I followed the answer provided to this question. I'm pretty sure my problem was that ubuntu-desktop must have been removed by my purging of all nvidia modules before I installed the new driver in the first place.

After a reboot my system was working again and I could install a nvidia driver again using

sudo ubuntu-drivers autoinstall

(which is the same as before, so I really think it had to do with ubuntu-desktop).

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