Readers with 2.1 or 2.4 BIOS have been reporting that they are unable to get Ubuntu Feisty Fawn 7.04 to install on their 1501s. The simple solution is to downgrade your BIOS back to 1.7. When you start up your PC there is a giant Dell splash screen. Right under it you can find your bios version. Get older BIOS from Dell's support website HERE
I will caution that if you are not comfortable with possibly ruining your laptop and turning it into a useless brick do not attempt to flash your BIOS.
REMEMBER YOU HAVE TO HAVE YOUR LAPTOP PLUGGED IN WHEN FLASHING.