When I call lxc-attach, I get an error:

# lxc-attach -n ubu-guest
lxc-attach: No such file or directory - failed to open '/proc/12580/ns/pid'
lxc-attach: failed to enter the namespace

Sure enough, /proc/12580/ns doesn't exist.

Is this because my kernel is too old?  Or am I missing a mount or
config or something?

This happens on both Fedora 13 and Ubuntu Lucid:

Linux version 2.6.33.6-147.fc13.x86_64
([email protected]) (gcc version 4.4.4 20100630
(Red Hat 4.4.4-10) (GCC) ) #1 SMP Tue Jul 6 22:32:17 UTC 2010

Linux version 2.6.32-24-generic-pae (bui...@vernadsky) (gcc version
4.4.3 (Ubuntu 4.4.3-4ubuntu5) ) #41-Ubuntu SMP Thu Aug 19 02:43:57 UTC
2010

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