A stock Ubuntu install ships an ancient Docker package under a different name entirely — docker.io — if it ships one at all, and that package trails months or years behind what Docker actually maintains. The reliable path on a VPS is Docker's own apt repository, which tracks Docker Engine releases directly and gets you …

A VPS you stood up six months ago and rarely log into is the most dangerous machine you own. It is still serving traffic, still listening on its open ports, and still running whatever package versions it had the day you walked away — including the ones with public exploits published last week. Patch hygiene is the …