Comment 17 for bug 636278

(In reply to comment #11)
> When switching to Maverick, I noticed many games ceased to work (such as
> Starcraft 2) ; I worked around the issue by editing
> /etc/sysctl.d/10-ptrace.conf and setting kernel.yama.ptrace_scope = 0.
>
> Thanks for the tip, even though I guess this change may have other
> consequences...

The release notes for maverick meerkat comment on that ptrace change:
http://www.ubuntu.com/content/maverick-meerkat-alpha-3#Linux%20kernel%202.6.35