Public bug reported:

Binary package hint: binfmt-support

As part of LTSP fat client installations, the following instructions are
performed (cut down version):

$ chroot "$ROOT" mount -t proc proc /proc
$ chroot "$ROOT" update-binfmts --import wine
$ umount "$ROOT/proc"

At this point we get:
$ umount: /opt/ltsp/i386/proc: device is busy.
$         (In some cases useful info about processes that use
$         the device is found by lsof(8) or fuser(1))
...and we're forced to resort to `umount -l` to work around this problem.

Is the any way to call update-binfmts in a chroot (e.g. to install wine)
without having to resort to `umount -l`?

** Affects: binfmt-support (Ubuntu)
     Importance: Undecided
         Status: New

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Cannot umount /proc after using update-binfmts in a chroot
https://bugs.launchpad.net/bugs/534211
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