Updates for Ubuntu 16.04 1) Do not delete source iso if it existed before 2) Check that we are running under Ubuntu 16.04 3) If so:    a) Install syslinux AND syslinux-utils if not installed    b) Update "late" command
Updates for Ubuntu 16.04
1) Do not delete source iso if it existed before
2) Check that we are running under Ubuntu 16.04
3) If so:
   a) Install syslinux AND syslinux-utils if not installed
   b) Update "late" command

netson/ubuntu-unattended,borotj/ubuntu-unattended