Problem: Copmuter is not starting at all anymore

I’m using on one of the computer Manjaro Linux.
Unfortunately it seems I deleted something really important on the last upgrade.
The computer starts, I can decrypt my SSD, and I see the login screen. So far so good.
But if I log in, I then see only a black screen with the mouse. But I can’t move the mouse and also no keyboard is working.
Also the shortcut for going into termimal mode (CTRL + ALT F3 / F4…) is not reacting.

Solution: Change the Grub

Go into the GRUB menu, and change the code in there: Add:

$ systemd.unit=multi-user.target

it should look like, this, add it at the end of the linux line:

linux /boot/vmlinuz-........ systemd.unit=multi-user.target

Save and reboot by pressing: CTRL x

Go back to Gnome GUI after fixing

sudo systemctl enable gdm