Clean up old kernels on Ubuntu and free /boot
When /boot fills with old linux-image packages, apt stops configuring anything. Find the kernels you can remove safely, and keep the one you booted.
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do-release-upgrade: no new release found
Your Ubuntu server reports no new release found. Work through the Prompt setting, the LTS point release gate, third party repos and held packages.
Which Python to Install on Ubuntu Server
Ubuntu's own tools run on /usr/bin/python3, so never replace it. Run a newer Python beside it with uv, the deadsnakes PPA or Docker. Here is which to pick.
Fix Tailscale install errors on Ubuntu
Most Tailscale install errors on Ubuntu are apt errors. Read the status code apt printed, then fix the release codename or the signing keyring.
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.
Why unattended-upgrades does nothing on Debian
Debian ships unattended-upgrades switched off. Enable it properly, read Origins-Pattern, check the apt-daily timers, and prove it patches itself.
apt to dnf: equivalents for Rocky and Fedora
The dnf command for every apt command you already know, on Rocky Linux, AlmaLinux and Fedora, plus the repository and rollback parts that do not map.
Fix duplicate apt sources and deb822 files
apt update says a target is configured multiple times. Find the legacy .list and deb822 .sources pair, keep one, and get a clean update run back.