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So I'm running Kubuntu 12.10 x64:

uname -v -p  #29-Ubuntu SMP Fri Oct 19 10:26:51 UTC 2012 x86_64

and Virtual Box 4.2 installed from the VBox repositories.

Any time I try to install a 64-bit OS as a guest the install fails and crashes w/ a kernel panic on Ubuntu or bombs in Windows 7 before it will boot.

Am I missing something?

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Possibly related:… and… – Takkat Nov 15 '12 at 7:31
up vote 1 down vote accepted

64-bit guest should be supported, even on a 32-bit Host.

But do check the requirements and see if anything is missed out, make sure: VT-x/AMD-V is enabled in BIOS.

Also check the docs:

If you can paste the error message (Kernel Panic/BSOD?), we can assist better;-)

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Thanks for this... Double checekd and everything was set, not quite sure but I unchecked all the settings and rechecked them and it worked. Thanks for the advice and helping out – jjesse Nov 16 '12 at 1:49

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