I just installed an Ubuntu Server and after the server was updated, upgraded and rebooted, I get the error "Cannot display this video mode".

It was kinda funny because the server is headless. The monitor was properly connected. I figured it was a resolution error. A little googling around and I found the solution:

It was good though, that I had configured my IP/network settings, so I had SSH access to the box.

1) Edit grub as follows:

sudo nano /etc/default/grub

remove the "#" in front of the line #GRUB_GFXMODE=640X480

2) do ctrl+x to save and exit,

then, do:

3) sudo upgrade-grub
sudo reboot

My screen came back to life.
Thats all folks

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