Comment 17 for bug 1684090

This bug was fixed in the package livecd-rootfs - 2.408.16

---------------
livecd-rootfs (2.408.16) xenial; urgency=medium

  * live-build/ubuntu-cpc/functions: call apt-get update in the chroot
    after mounting a blank /var/lib/apt, so that further operations work
    as expected; otherwise, 'apt-get purge ^grub-.*' fails on s390x because
    no such packages are known to apt.
  * live-build/ubuntu-cpc/hooks/030-root-tarball.binary: correct a missing
    unmount of /var/{lib,cache}/apt on cleanup, detected via autopkgtests.

 -- Steve Langasek <email address hidden> Tue, 12 Sep 2017 13:25:58 -0700