I have the problem that Ubuntu doesn't load the splash screen anymore (after upgrading from 10.10 to 11.04). After the Grub-bootloader, it takes a few seconds to load and then the monitor turns black.
I already tried to boot from a Ubuntu Live CD, but the result was the same error. Furthermore I tried to start the protected mode, but it freezes just after showing me menu.
Do you have any solutions for this? And is it possible to switch from Grub to the Ubuntu console?