Release Notes for Debian 11 (bullseye), 64-bit PC

The Debian Documentation Project

This document is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License, version 2, as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

The license text can also be found at https://www.gnu.org/licenses/gpl-2.0.html and /usr/share/common-licenses/GPL-2 on Debian systems.


Table of Contents

1. Introduction
1.1. Reporting bugs on this document
1.2. Contributing upgrade reports
1.3. Sources for this document
2. What's new in Debian 11
2.1. Supported architectures
2.2. What's new in the distribution?
3. Installation System
3.1. What's new in the installation system?
3.1.1. Automated installation
4. Upgrades from Debian 10 (buster)
4.1. Preparing for the upgrade
4.1.1. Back up any data or configuration information
4.1.2. Inform users in advance
4.1.3. Prepare for downtime on services
4.1.4. Prepare for recovery
4.1.5. Prepare a safe environment for the upgrade
4.2. Checking APT configuration status
4.2.1. The proposed-updates section
4.2.2. Unofficial sources
4.2.3. Disabling APT pinning
4.2.4. Checking packages status
4.3. Preparing APT source-list files
4.3.1. Adding APT Internet sources
4.3.2. Adding APT sources for a local mirror
4.3.3. Adding APT sources from optical media
4.4. Upgrading packages
4.4.1. Recording the session
4.4.2. Updating the package list
4.4.3. Make sure you have sufficient space for the upgrade
4.4.4. Minimal system upgrade
4.4.5. Upgrading the system
4.5. Possible issues during upgrade
4.5.1. Dist-upgrade fails with Could not perform immediate configuration
4.5.2. Expected removals
4.5.3. Conflicts or Pre-Depends loops
4.5.4. File conflicts
4.5.5. Configuration changes
4.5.6. Change of session to console
4.6. Upgrading your kernel and related packages
4.6.1. Installing a kernel metapackage
4.7. Preparing for the next release
4.7.1. Purging removed packages
4.8. Obsolete packages
4.8.1. Transitional dummy packages
5. Issues to be aware of for bullseye
5.1. Upgrade specific items for bullseye
5.2. Limitations in security support
5.3. Package specific issues
6. More information on Debian
6.1. Further reading
6.2. Getting help
6.2.1. Mailing lists
6.2.2. Internet Relay Chat
6.3. Reporting bugs
6.4. Contributing to Debian
A. Managing your buster system before the upgrade
A.1. Upgrading your buster system
A.2. Checking your APT source-list files
A.3. Removing obsolete configuration files
A.4. Upgrade legacy locales to UTF-8
B. Contributors to the Release Notes
Index
Glossary