to elaborate on the "resource busy" issue... you need to remove/kill the
running processes from the cgroup in order to remove the folder.

view the tasks with:

$ cat /cgroup/ubuntu-lucid/tasks
<all the pids assigned to this cgroup>

$ kill -15 <all the pids assigned to above cgroup>

most processes should die, unless it was pid one in the container, then
it will need a kill -9.  after that you can:

$ rmdir /cgroup/ubuntu-lucid

so long as there are no more nested directories under /cgroup/ubuntu-
lucid.

-- 
LXC does not work with lucid host and lucid container
https://bugs.launchpad.net/bugs/512200
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