I have got a really nice looking error on Ubuntu – “The system is running in low-graphics mode”. And none of proposed actions worked. I was not even able to get grub menu during boot.

Other texts on internet suggest reinstalling graphic card drivers but I found that problem can be a little bit simpler. So before you jump into big changes try following:

  1. Boot Ubuntu from CD of USB
    • To be able to boot from USB this possibility must be allowed in Bios. Attention – it can happen that Bios does not have “blank” possibility to choose “boot from USB”. if so, attach USB stick, reboot into Bios a choose this USB stick as 1.boot option. And save changes and boot again.
  2. Run terminal and enter:
    • sudo su –
      • this will give you root access
    • mkdir /mnt/hdd1
      • this creates mounting poing
    • mount /dev/sda1 /mnt/hdd1
      • this mounts your first HDD partition
    • ls /mnt/sda1
      • look what is on your first partition – if you do not see folders like etc, var and so on, then you need to repeat last steps for /dev/sda2 (mkdir /mnt/hdd2; mount /dev/sda2 /mnt/hdd2; ls /mnt/hdd2; )
  3. Go into etc folder and check several files for some weird stuff:
    1. rc.local
      • should contain only comments and “exit 0” line – comment says “by default this script does nothing” – so check if there is not something else
    2. etc/lightdm/lighthdm.conf
      • check content on internet – settings “greeter-setup-script” can be the good start
      • if it is empty or missing it should be OK
    3. /etc/X11/xorg.conf
      • if missing or corrupted use default:
        • cp /etc/X11/xorg.conf.orig /etc/X11/xorg.conf