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Name showing in log in?
(mander.xyz)
Debian is a free operating system (OS) for your computer. An operating system is the set of basic programs and utilities that make your computer run. Debian provides more than a pure OS: it comes with over 59000 packages, precompiled software bundled up in a nice format for easy installation on your machine.
I dont know of an easy, clean and elegant way of doing what you ask. I wonder what happens if you edit /etc/passwd with the new name, I wouldn't dare to try. The way I'd proceed though is to start a bare repo with my dotfiles, so if anything happens, I'm back in business with minimal configuration changes.
This is a video about bare git repo: https://www.youtube.com/watch?v=tBoLDpTWVOM&t=0
Stolen from this other video: https://www.youtube.com/watch?v=ApkoY-PN0Nk&t=0