Comment 4 for bug 77589

Can confirm this on an attempt to debootstrap a Debian sid chroot under Feisty.

Running the command where the `W' warning emits (chroot /mnt/usb mount -t proc proc /proc) shows that libdevmapper isn't present in the chroot, which is somewhat required by the mount call on /proc to succeed. Including that in the debootstrap invocation ( e.g. `--include=dmsetup,libdevmapper1.02' or libdevmapper1.02.1 when pulling from Debian sid) should work.