It’s hard to admit, but 0ut3r.space was running on Debian 9 (shame on me, on the 30 June 2022, Debian 9 “Stretch” went End of Life). A few days ago, I upgraded it to Debian 11. I thought it may be useful for someone to provide steps I did. Here it is, short article about upgrading 0ut3r.space from Debian 9 to