diff --git a/etc/apt/sources.list/ubuntu b/etc/apt/sources.list/ubuntu
deleted file mode 100644
index b6e73ecb..00000000
--- a/etc/apt/sources.list/ubuntu
+++ /dev/null
@@ -1,49 +0,0 @@
-# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
-# newer versions of the distribution.
-deb http://COUNTRYCODE.archive.ubuntu.com/ubuntu/ CODENAME main restricted
-deb-src http://COUNTRYCODE.archive.ubuntu.com/ubuntu/ CODENAME main restricted
-
-## Major bug fix updates produced after the final release of the
-## distribution.
-deb http://COUNTRYCODE.archive.ubuntu.com/ubuntu/ CODENAME-updates main restricted
-deb-src http://COUNTRYCODE.archive.ubuntu.com/ubuntu/ CODENAME-updates main restricted
-
-## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
-## team. Also, please note that software in universe WILL NOT receive any
-## review or updates from the Ubuntu security team.
-deb http://COUNTRYCODE.archive.ubuntu.com/ubuntu/ CODENAME universe
-deb-src http://COUNTRYCODE.archive.ubuntu.com/ubuntu/ CODENAME universe
-deb http://COUNTRYCODE.archive.ubuntu.com/ubuntu/ CODENAME-updates universe
-deb-src http://COUNTRYCODE.archive.ubuntu.com/ubuntu/ CODENAME-updates universe
-
-## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
-## team, and may not be under a free licence. Please satisfy yourself as to
-## your rights to use the software. Also, please note that software in
-## multiverse WILL NOT receive any review or updates from the Ubuntu
-## security team.
-deb http://COUNTRYCODE.archive.ubuntu.com/ubuntu/ CODENAME multiverse
-deb-src http://COUNTRYCODE.archive.ubuntu.com/ubuntu/ CODENAME multiverse
-deb http://COUNTRYCODE.archive.ubuntu.com/ubuntu/ CODENAME-updates multiverse
-deb-src http://COUNTRYCODE.archive.ubuntu.com/ubuntu/ CODENAME-updates multiverse
-
-## N.B. software from this repository may not have been tested as
-## extensively as that contained in the main release, although it includes
-## newer versions of some applications which may provide useful features.
-## Also, please note that software in backports WILL NOT receive any review
-## or updates from the Ubuntu security team.
-deb http://COUNTRYCODE.archive.ubuntu.com/ubuntu/ CODENAME-backports main restricted universe multiverse
-deb-src http://COUNTRYCODE.archive.ubuntu.com/ubuntu/ CODENAME-backports main restricted universe multiverse
-
-## Uncomment the following two lines to add software from Canonical's
-## 'partner' repository.
-## This software is not part of Ubuntu, but is offered by Canonical and the
-## respective vendors as a service to Ubuntu users.
-deb http://COUNTRYCODE.archive.canonical.com/ubuntu CODENAME partner
-deb-src http://COUNTRYCODE.archive.canonical.com/ubuntu CODENAME partner
-
-deb http://security.ubuntu.com/ubuntu/ CODENAME-security main restricted
-deb-src http://security.ubuntu.com/ubuntu/ CODENAME-security main restricted
-deb http://security.ubuntu.com/ubuntu/ CODENAME-security universe
-deb-src http://security.ubuntu.com/ubuntu/ CODENAME-security universe
-deb http://security.ubuntu.com/ubuntu/ CODENAME-security multiverse
-deb-src http://security.ubuntu.com/ubuntu/ CODENAME-security multiverse
diff --git a/etc/apt/sources.list/ubuntu-mirror/14.04 b/etc/apt/sources.list/ubuntu-mirror/14.04
deleted file mode 100644
index 5b5cf5a2..00000000
--- a/etc/apt/sources.list/ubuntu-mirror/14.04
+++ /dev/null
@@ -1,40 +0,0 @@
-## Main repositories
-deb mirror://mirrors.ubuntu.com/mirrors.txt trusty main restricted universe multiverse
-deb-src mirror://mirrors.ubuntu.com/mirrors.txt trusty main restricted universe multiverse
-deb mirror://mirrors.ubuntu.com/mirrors.txt trusty-updates main restricted universe multiverse
-deb-src mirror://mirrors.ubuntu.com/mirrors.txt trusty-updates main restricted universe multiverse
-deb mirror://mirrors.ubuntu.com/mirrors.txt trusty-security main restricted universe multiverse
-deb-src mirror://mirrors.ubuntu.com/mirrors.txt trusty-security main restricted universe multiverse
-deb http://security.ubuntu.com/ubuntu trusty-security main restricted universe multiverse
-deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted universe multiverse
-
-## Backports
-## https://help.ubuntu.com/community/UbuntuBackports
-deb mirror://mirrors.ubuntu.com/mirrors.txt trusty-backports main restricted universe multiverse
-deb-src mirror://mirrors.ubuntu.com/mirrors.txt trusty-backports main restricted universe multiverse
-
-## Pre-release updates
-## https://wiki.ubuntu.com/Testing/EnableProposed
-#deb mirror://mirrors.ubuntu.com/mirrors.txt trusty-proposed main restricted universe multiverse
-#deb-src mirror://mirrors.ubuntu.com/mirrors.txt trusty-proposed main restricted universe multiverse
-
-## Proprietary and closed-source software
-deb http://archive.canonical.com/ubuntu trusty partner
-deb-src http://archive.canonical.com/ubuntu trusty partner
-
-## New applications not in repositories during release
-deb http://extras.ubuntu.com/ubuntu trusty main
-deb-src http://extras.ubuntu.com/ubuntu trusty main
-
-## 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 trusty main restricted universe multiverse
-#deb http://ddebs.ubuntu.com trusty-updates main restricted universe multiverse
-## Ignore unless you have enabled proposed
-#deb http://ddebs.ubuntu.com trusty-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/trusty-mate/ubuntu trusty main
-#deb-src http://ppa.launchpad.net/ubuntu-mate-dev/trusty-mate/ubuntu trusty main
diff --git a/etc/apt/sources.list/ubuntu-mirror/16.04 b/etc/apt/sources.list/ubuntu-mirror/16.04
deleted file mode 100644
index 1c24b726..00000000
--- a/etc/apt/sources.list/ubuntu-mirror/16.04
+++ /dev/null
@@ -1,36 +0,0 @@
-## 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
diff --git a/etc/apt/sources.list/ubuntu-mirror/18.04 b/etc/apt/sources.list/ubuntu-mirror/18.04
deleted file mode 100644
index a3e2aa84..00000000
--- a/etc/apt/sources.list/ubuntu-mirror/18.04
+++ /dev/null
@@ -1,36 +0,0 @@
-## Main repositories
-deb mirror://mirrors.ubuntu.com/mirrors.txt bionic main restricted universe multiverse
-deb-src mirror://mirrors.ubuntu.com/mirrors.txt bionic main restricted universe multiverse
-deb mirror://mirrors.ubuntu.com/mirrors.txt bionic-updates main restricted universe multiverse
-deb-src mirror://mirrors.ubuntu.com/mirrors.txt bionic-updates main restricted universe multiverse
-deb mirror://mirrors.ubuntu.com/mirrors.txt bionic-security main restricted universe multiverse
-deb-src mirror://mirrors.ubuntu.com/mirrors.txt bionic-security main restricted universe multiverse
-deb http://security.ubuntu.com/ubuntu bionic-security main restricted universe multiverse
-deb-src http://security.ubuntu.com/ubuntu bionic-security main restricted universe multiverse
-
-## Backports
-## https://help.ubuntu.com/community/UbuntuBackports
-deb mirror://mirrors.ubuntu.com/mirrors.txt bionic-backports main restricted universe multiverse
-deb-src mirror://mirrors.ubuntu.com/mirrors.txt bionic-backports main restricted universe multiverse
-
-## Pre-release updates
-## https://wiki.ubuntu.com/Testing/EnableProposed
-#deb mirror://mirrors.ubuntu.com/mirrors.txt bionic-proposed main restricted universe multiverse
-#deb-src mirror://mirrors.ubuntu.com/mirrors.txt bionic-proposed main restricted universe multiverse
-
-## Proprietary and closed-source software
-deb http://archive.canonical.com/ubuntu bionic partner
-deb-src http://archive.canonical.com/ubuntu bionic 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 bionic main restricted universe multiverse
-#deb http://ddebs.ubuntu.com bionic-updates main restricted universe multiverse
-## Ignore unless you have enabled proposed
-#deb http://ddebs.ubuntu.com bionic-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/bionic-mate/ubuntu bionic main
-#deb-src http://ppa.launchpad.net/ubuntu-mate-dev/bionic-mate/ubuntu bionic main
diff --git a/etc/apt/sources.list/ubuntu-mirror/README.md b/etc/apt/sources.list/ubuntu-mirror/README.md
deleted file mode 100644
index dac0ad29..00000000
--- a/etc/apt/sources.list/ubuntu-mirror/README.md
+++ /dev/null
@@ -1 +0,0 @@
-WARNING: `do-release-upgrade` doesn't like this!