I've recently installed Ubuntu 12.04 via wubi, and have so far been unsuccessful in configuring the system to allow a 1366x768 screen resolution. The platform is an HP Pavilion g6-1d73us with Intel HD Graphics 3000, and in Windows 7 the highest resolution is 1366x768.
Please let me know what specific information is needed to diagnose this problem, and I will be happy to report back here.