boot into text mode

You may want your workstation to start (and stay) in text mode, rather than booting up a window manager. There are two parts to this; the boot loader and the boot process. Change them both by editing the grub.conf file

sudo vi /etc/default/grub

# Comment out these two to prevent the "error: no video mode activated" bug



sudo update-grub

In versions 15.* of ubuntu, you'll need to also execute the command

sudo systemctl set-default

You can then start the window manager with the command

sudo start lightdm