just input your own password. root account is disabled by default on ubuntu and is using the primary user account instead.

in a terminal, type: sudo XXXX
in gui, ALT+F2, type: gksu XXXX

where XXX is your command/program

care to tell us about your graphic chipset? Is it an integrated Intel 915?

if yes, have a look here: http://ubuntuguide.org/wiki/Ubuntu:Feisty#...ion_.28Intel.29

That won't do it for you, since it's for 8xx/9xx intel chipsets.

Quick google search gave me this: https://help.ubuntu.com/community/FixVideoResolutionHowto Check out the ATI section. You'll need to install ATI's proprietary driver for that (System > Administration > Restricted Drivers Manager).

Good luck.

Install applications from your distribution's repository if you want dependencies to be managed automatically.

To fix your problem, type this in a terminal:

any error message? give more info pls