FAI 4 setup broken

[Steve B.]

Ran an apt-get update and FAI 4 gets installed and now my FAI is totally
broken.  I try to run setup and get

install_packages: executing chroot /srv/fai/nfsroot apt-get clean
2 errors during executing of commands

umount: /srv/fai/nfsroot/proc: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))
Aborting
umount: /srv/fai/nfsroot/proc: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))
Log file written to /var/log/fai/fai-setup.log


Appears it's FAI why the device is busy so can't get past this?

Steve B.
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