Reading package lists... Done
W: The repository 'cdrom://Ubuntu 16.04.1 LTS _Xenial Xerus_ - Release amd64 (20160719) xenial Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: Target Sources (main/source/Sources) is configured multiple times in /etc/apt/sources.list.d/diesch-ubuntu-testing-xenial.list:2 and /etc/apt/sources.list.d/diesch-ubuntu-testing-xenial.list:3
W: Target Sources (main/source/Sources) is configured multiple times in /etc/apt/sources.list.d/snwh-ubuntu-pulp-xenial.list:2 and /etc/apt/sources.list.d/snwh-ubuntu-pulp-xenial.list:3