When pressing "continue" after the Installer has checked hd-space, internet-connectivity and power, the "continue" button grays out and mouse pointer turns into some round spinning thing, but nothing happens after that. I've tried with lan-cable connected, lan-cable disconnected, wireless connected and wireless disconnected.
What should I do? Installing 12.04 on the same machine was trouble free.
This only occurs on single processor systems, or when booting on a dual processor system with "nosmp" or "maxcpus=1" in the kernel parameters.