1) In grub, select Advanced options, then recovery mode
2) Select "Drop to root shell"
3) Press Enter to confirm
4) The filesystem is mounted read-only at this point, so remount it: mount -o rw,remount /
5) Install the needed package: apt install xserver-xorg-input-all
6) Press Ctrl+D to leave the root shell.
7) Select resume boot from the menu.
From the top of my head:
1) In grub, select Advanced options, then recovery mode xorg-input- all
2) Select "Drop to root shell"
3) Press Enter to confirm
4) The filesystem is mounted read-only at this point, so remount it: mount -o rw,remount /
5) Install the needed package: apt install xserver-
6) Press Ctrl+D to leave the root shell.
7) Select resume boot from the menu.
Here are some more information regarding the recovery mode: https:/ /wiki.ubuntu. com/RecoveryMod e