apt remove vs purge vs autoremove, explained
Run apt remove, purge and autoremove on a test package, read what each one leaves behind, and learn why autoremove can take a tool you use and how to stop it.
#package-management
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dnf module streams on Rocky and Alma 9
Read the [d] and [e] markers in dnf module list, pick or switch an AppStream stream on Rocky and Alma 9, and see what EL10 deprecation means for upgrades.
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.