## Main repositories
deb mirror://mirrors.ubuntu.com/mirrors.txt xenial main restricted universe multiverse
deb-src mirror://mirrors.ubuntu.com/mirrors.txt xenial main restricted universe multiverse
deb mirror://mirrors.ubuntu.com/mirrors.txt xenial-updates main restricted universe multiverse
deb-src mirror://mirrors.ubuntu.com/mirrors.txt xenial-updates main restricted universe multiverse
deb mirror://mirrors.ubuntu.com/mirrors.txt xenial-security main restricted universe multiverse
deb-src mirror://mirrors.ubuntu.com/mirrors.txt xenial-security main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu xenial-security main restricted universe multiverse
deb-src http://security.ubuntu.com/ubuntu xenial-security main restricted universe multiverse

## Backports
## https://help.ubuntu.com/community/UbuntuBackports
deb mirror://mirrors.ubuntu.com/mirrors.txt xenial-backports main restricted universe multiverse
deb-src mirror://mirrors.ubuntu.com/mirrors.txt xenial-backports main restricted universe multiverse

## Pre-release updates
## https://wiki.ubuntu.com/Testing/EnableProposed
#deb mirror://mirrors.ubuntu.com/mirrors.txt xenial-proposed main restricted universe multiverse
#deb-src mirror://mirrors.ubuntu.com/mirrors.txt xenial-proposed main restricted universe multiverse

## Proprietary and closed-source software
deb http://archive.canonical.com/ubuntu xenial partner
deb-src http://archive.canonical.com/ubuntu xenial partner

## Non-built-in debug symbol packages
## https://wiki.ubuntu.com/DebuggingProgramCrash
## sudo apt-key adv --keyserver hkps://keys.openpgp.org --recv-keys 428D7C01
#deb http://ddebs.ubuntu.com xenial main restricted universe multiverse
#deb http://ddebs.ubuntu.com xenial-updates main restricted universe multiverse
## Ignore unless you have enabled proposed
#deb http://ddebs.ubuntu.com xenial-proposed main restricted universe multiverse

## Ubuntu MATE
## apt-key adv --keyserver hkps://keys.openpgp.org --recv-keys 709A860A600B9A61FEF5346AFB01CC26162506E7
#deb http://ppa.launchpad.net/ubuntu-mate-dev/xenial-mate/ubuntu xenial main
#deb-src http://ppa.launchpad.net/ubuntu-mate-dev/xenial-mate/ubuntu xenial main