Updated over 1 year ago by Jessica Oros

• Table of contents
• Debian 10 to 11
  • Pre update check
    • Stretch check
    • Metapackage check
    • Purged package check
    • Hold check
  • Update sources list
  • Upgrade the system
    • Update the sources
    • Check for Necessary Disk Space
    • Minimal Upgrade
    • Full Upgrade
      • Change configs during full upgrade?
    • Upgrade MySQL databases (if MySQL/MariaDB installed)
    • Check that things are up
    • Check what packages were removed
  • Common problems

Debian 10 to 11¶

Pre update check¶

Stretch check¶

Check if any sources still point to stretch

cd /etc/apt
grep -nr stretch .

If so, bring those up to buster and run updates first
https://redmine.palantetech.coop/projects/commons/wiki/Debian_9_to_10

Metapackage check¶

Check to make sure kernel metapackage is installed, not just specific kernel

dpkg -l "linux-image*" | grep ^ii | grep -i meta should have results
If not, install metapackage
https://www.debian.org/releases/bullseye/amd64/release-notes/ch-upgrading.en.html#kernel-metapackage

Purged package check¶

List and purge removed packages with config files remaining
https://www.debian.org/releases/bullseye/amd64/release-notes/ch-upgrading.en.html#purge-removed-packages

aptitude search '~c'
aptitude purge '~c'

Hold check¶

These commands should have no results

aptitude search "~ahold" 
dpkg --get-selections | grep 'hold$'

Update sources list¶

Check which sources exist that point to buster

cd /etc/apt
grep -nr buster .

Edit the main list, and any others that come up

vim /etc/apt/sources.list

replace buster with bullseye

:%s/buster/bullseye/g

replace bullseye/updates with bullseye-security

:%s/bullseye\/updates/bullseye-security/g

https://www.debian.org/releases/bullseye/amd64/release-notes/ch-information.en.html#security-archive

Upgrade the system¶

Update the sources¶

apt-get update

If you get a NO_PUBKEY error like below

W: GPG error: https://apt.postgresql.org/pub/repos/apt bullseye-pgdg InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7FCC7D46ACCC4CF8

add the key for the specified repository:

0 meat:/etc/apt# sudo gpg -a --export 7FCC7D46ACCC4CF8 | sudo apt-key add -

Check for Necessary Disk Space¶

apt-get -o APT::Get::Trivial-Only=true dist-upgrade

Minimal Upgrade¶

 apt-get upgrade

• if it asks whether to change /etc/apt/trusted.gpg.d/debian-archive-jessie-security-automatic.gpg, say yes
• other things it asks to change, say no, keep the existing file

Full Upgrade¶

apt-get dist-upgrade

Change configs during full upgrade?¶

package	change configs
nrpe	no
sudoers	no
journald	no
backupninja	no
nginx	yes but recheck after
redis	yes but recheck after
sshd_config	yes
glibc	yes

Upgrade MySQL databases (if MySQL/MariaDB installed)¶

mysql_upgrade

Check that things are up¶

• if a web server, make sure websites are up
• if an infrastructure server, test and make sure all parts of the infrastructure are working properly
• if a PTC server check the recovery plan entry for that server to make sure everything has recovered

Check what packages were removed¶

• cat /var/log/apt/history.log | grep Remove
• copy that into ongoing updates documentation for records
• Make sure there was nothing important in there
• If there were important packages in there
  • check aptitude to see if newer versions were already installed
  • check debian package search to search for what version is appropriate
  • https://packages.debian.org/

Common problems¶

tbd