To use our repositories, follow the instructions below: Set up the APT configuration and import our signing key.


This is our main repository which contains our core packages.

Set up a file at /etc/apt/sources.list.d/bunsen.list with the following contents:

deb bunsen-hydrogen main


This is an auxiliary repository containing packages backported from Debian testing and imported from Ubuntu.

Set up /etc/apt/sources.list.d/bunsen-jessie-backports.list with the following contents:

deb jessie-backports main

The backports repo’s packages will have a pin priority of 100, so regular jessie packages will continue to take precedence until you explicitly install a backported package.

To upgrade a package to its backports version, target the backports distribution as follows:

Subsequent package upgrades will be installed from the backports repo or the regular repository, whichever package version is higher.


This is an auxiliary repository containing packages backported from Debian Testing and Unstable. It should be used only with BL Helium or Debian Stretch.

Set up /etc/apt/sources.list.d/bunsen-stretch-backports.list with the following contents:

deb stretch-backports main


We currently operate two repository mirrors. If you specify the host in your APT configuration, you will be redirected automatically to the preferred server based on your IP addresses geolocation:

If you get redirected to but notice that your ISP has a faster route to the EU server than the Singapore one, put into your APT configuration in order to opt out from the redirect. Similarly, users in Europe, the Americas or Africa for whom is faster should switch to that mirror.

Access via HTTPS

You may change the http:// prefix in your BL repository URLs to https:// in order to access the repositories using an encrypted connection. Before setting this up, ensure that the package apt-transport-https is installed on your system. The package is part of the BL standard installation.

You might see apt-get update complaining sporadically with the error: W: Size of file [...] is not what the server reported. apt has some strange issues in conjunction with apt-transport-https which are hard to debug despite having been declared fixed before (e.g. Debian bug #802617). As a workaround, either ignore the messages or do not use apt-transport-https.

Signing key

The preferred method for installing our archive key on your system is using the provided keyring package.

Keyring package

Download the latest .deb keyring package and install it:

Manual setup

Fetch and verify the repository’s signing key:

The key’s fingerprint as displayed by gpg should be identical with the following hexstring:

3172 4784 0522 7490 BBB7 43E6 A067 3F72 FE62 D9C5 

If that is not the case, you have got the wrong key. Use a safe, non-intercepted internet connection in order to retrieve the correct key file.

Finally, add the key to APT and update the package index:

You may now install bunsen-* packages provided by the repository.