Revert "extra/vm: Remove unnecessary apt-get workaround"

This reverts commit 091538f9fb8aecde8ca5516e1635dc5d87058b98.
Revert "fixup! extra/vm: Update to Ubuntu 14.04 for GStreamer 1 support"

This reverts commit b0794ea99159fcef4739d0d123c5bcc70eacf1e4.