[...]
3m20.8s DUMP:   Setting up libplot2c2 (2.5-1) ...
3m20.8s DUMP:
3m20.8s DEBUG: Command ok: 'chroot /tmp/tmplQfj9K apt-get -yf --no-remove install'
3m20.8s DEBUG: Starting command: chroot /tmp/tmplQfj9K apt-get clean
3m20.8s DEBUG: Command ok: 'chroot /tmp/tmplQfj9K apt-get clean'
3m20.8s DEBUG: Removing /tmp/tmplQfj9K/tmp/libplot2c2_2.5-1_i386.deb
3m20.8s DEBUG: Starting command: lsof +D /tmp/tmplQfj9K
3m21.0s DUMP:   lsof: WARNING: can't stat() ext3 file system /dev/.static/dev
3m21.0s DUMP:         Output information may be incomplete.
3m21.0s DUMP:   lsof: WARNING: can't stat() ext3 file system /data
3m21.0s DUMP:         Output information may be incomplete.
3m21.0s DUMP:   lsof: WARNING: can't stat() proc file system /data/chroots/potato/proc
3m21.0s DUMP:         Output information may be incomplete.
3m21.8s DEBUG: Command failed (status=256), but ignoring error: 'lsof +D /tmp/tmplQfj9K'
3m21.8s ERROR: Processes are running inside chroot:
  lsof: WARNING: can't stat() ext3 file system /dev/.static/dev
        Output information may be incomplete.
  lsof: WARNING: can't stat() ext3 file system /data
        Output information may be incomplete.
  lsof: WARNING: can't stat() proc file system /data/chroots/potato/proc
        Output information may be incomplete.

3m21.8s DEBUG: Starting command: chroot /tmp/tmplQfj9K umount /proc
3m21.9s DEBUG: Command ok: 'chroot /tmp/tmplQfj9K umount /proc'
3m23.4s DEBUG: Removed directory tree at /tmp/tmplQfj9K
(sid)flub@laurie:~/Debian_nochroot/Plotutils$