Natty Kernel Error

[Lucas.Betschart at crypto.ch]

Hello, after upgrading 10.10 to Beta 11.04 I can't boot my system with the standard natty kernel (2.6.38-8). But it works with the older 2.6.35-28 kernel.

When I choose "Recovery Mode" at GRUB, the system stops the boot process after "Skip stopping firewall: ufw (not enabled)". Then it looks like this:
"

 * Starting AppArmos profiles
Skipping profile in /etc/apparmor.d/disable: usr.bin.firefox		
											[ OK ]
 * Setting sensors limits							[ OK ]
Skip stopping firewall: ufw (not enabled)
_


"

I didn't fill in a bug report because maybe my upgrade process wasn't total correct.
I had to leave after 3/4 of the update and when I came backe it was shutted down.

Any idea what I can do? I already tried reinstalling the kernel with apt-get install --reinstall linux-image-2.6.38-8-generic, but nothing changed.