Debian 11 end of life: upgrade your server
Debian 11 bullseye lost LTS security support on 31 August 2026. Confirm your version, then upgrade in two careful hops to Debian 13 before apt stops working.
#release-upgrade
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Upgrade Ubuntu 22.04 to 26.04 (via 24.04)
There is no direct jump. Upgrade 22.04 to 24.04, verify and snapshot, then take the 26.04 hop. Covers the PPA, PHP, Python, database and netplan breaks.