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
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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.
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.
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.
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.