Debian Package Repositories

All Debian based systems use APT as a package management tool. The lists of repositories are defined in /etc/apt/sources.list and the .list files found in the /etc/apt/sources.d/ directory. Updates can be installed directly with the apt command line tool, or via the GUI.

APT sources.list files list one package repository per line, with the most preferred source listed first. Empty lines are ignored and a # character anywhere on a line marks the remainder of that line as a comment. The information available from the configured sources is acquired by apt update.

File: /etc/apt/sources.list
deb buster main contrib
deb buster-updates main contrib

# security updates
deb buster/updates main contrib

In addition, you need a package repository from Proxmox to get Proxmox Backup updates.


The Release files in the repositories are signed with GnuPG. APT is using these signatures to verify that all packages are from a trusted source.

If you install Proxmox Backup Server from an official ISO image, the verification key is already installed.

If you install Proxmox Backup Server on top of Debian, download and install the key with the following commands:

# wget -O /etc/apt/trusted.gpg.d/proxmox-ve-release-6.x.gpg

Verify the SHA512 checksum afterwards with:

# sha512sum /etc/apt/trusted.gpg.d/proxmox-ve-release-6.x.gpg

The output should be:

acca6f416917e8e11490a08a1e2842d500b3a5d9f322c6319db0927b2901c3eae23cfb5cd5df6facf2b57399d3cfa52ad7769ebdd75d9b204549ca147da52626 /etc/apt/trusted.gpg.d/proxmox-ve-release-6.x.gpg

and the md5sum:

# md5sum /etc/apt/trusted.gpg.d/proxmox-ve-release-6.x.gpg

Here, the output should be:

f3f6c5a3a67baf38ad178e5ff1ee270c /etc/apt/trusted.gpg.d/proxmox-ve-release-6.x.gpg

Proxmox Backup Enterprise Repository

This will be the default, stable, and recommended repository. It is available for all Proxmox Backup subscription users. It contains the most stable packages, and is suitable for production use. The pbs-enterprise repository is enabled by default:

File: /etc/apt/sources.list.d/pbs-enterprise.list
deb buster pbs-enterprise

To never miss important security fixes, the superuser (root@pam user) is notified via email about new packages as soon as they are available. The change-log and details of each package can be viewed in the GUI (if available).

Please note that you need a valid subscription key to access this repository. More information regarding subscription levels and pricing can be found at


You can disable this repository by commenting out the above line using a # (at the start of the line). This prevents error messages if you do not have a subscription key. Please configure the pbs-no-subscription repository in that case.

Proxmox Backup No-Subscription Repository

As the name suggests, you do not need a subscription key to access this repository. It can be used for testing and non-production use. It is not recommended to use it on production servers, because these packages are not always heavily tested and validated.

We recommend to configure this repository in /etc/apt/sources.list.

File: /etc/apt/sources.list
deb buster main contrib
deb buster-updates main contrib

# PBS pbs-no-subscription repository provided by,
# NOT recommended for production use
deb buster pbs-no-subscription

# security updates
deb buster/updates main contrib

Proxmox Backup Test Repository

This repository contains the latest packages and is heavily used by developers to test new features.

You can access this repository by adding the following line to /etc/apt/sources.list:

sources.list entry for pbstest
deb buster pbstest