I just installed Ubuntu 11.04 on HP Omnibook Xe3 with P3 1000 MgHz mobile processor and 384 Mb Ram. I had to take harddrive out of the laptop, connect it to my desktop via USB Harddrive adapter, and install Ubuntu to the drive from the desktop unit. Then I reinstalled the harddrive back into the laptop. It booted and works much faster that WinXP!