I have the same problem since I upgrade to Lucid.
It occur randomly only one or two time a week, other boot are fine.
It stuck at the Plymouth screen and need to press Ctrl+Alt+Del to reboot. It always boot normally the second time.
After that both Xorg.0.log and Xorg.failsafe.log finish with :
Fatal server error:
xf86OpenConsole: VT_WAITACTIVE failed: Interrupted system call
Kubuntu 10.4, ATI 5770, fglrx
I have the same problem since I upgrade to Lucid.
It occur randomly only one or two time a week, other boot are fine.
It stuck at the Plymouth screen and need to press Ctrl+Alt+Del to reboot. It always boot normally the second time.
After that both Xorg.0.log and Xorg.failsafe.log finish with :
Fatal server error:
xf86OpenConsole: VT_WAITACTIVE failed: Interrupted system call