maybe chmod 0644 'apt/sources.list.d/google-chrome.list'
maybe chmod 0644 'apt/sources.list.d/nextcloud-devs-client-bionic.list'
maybe chmod 0644 'apt/sources.list.d/official-package-repositories.list'
+maybe chmod 0644 'apt/sources.list.d/official-source-repositories.list'
maybe chmod 0644 'apt/sources.list.d/plex-media-server.list'
maybe chmod 0644 'apt/sources.list.d/plexmediaserver.list'
maybe chmod 0644 'apt/sources.list.d/puppet.list'
--- /dev/null
+deb-src http://ftp-stud.hs-esslingen.de/pub/Mirrors/packages.linuxmint.com tessa main upstream import backport
+
+deb-src http://ftp.tu-chemnitz.de/pub/linux/ubuntu bionic main restricted universe multiverse
+deb-src http://ftp.tu-chemnitz.de/pub/linux/ubuntu bionic-updates main restricted universe multiverse
+deb-src http://ftp.tu-chemnitz.de/pub/linux/ubuntu bionic-backports main restricted universe multiverse
+
+deb-src http://security.ubuntu.com/ubuntu/ bionic-security main restricted universe multiverse
+deb-src http://archive.canonical.com/ubuntu/ bionic partner