Got a source other than “Germany” wanted to switch to Linux? The only thing I am aware of is the city of Munich switching for a couple of years, which went fine, but then a new mayor from the conservative shitheads who has about as much clue of technology as a towel probably rolled it all back to Windows.
What is “Debian, instead of Ubuntu” supposed to imply? Ubuntu is a piece of shit ever since canonical ramped up the enshittification, first with desktop search expressions being default-forwarded to canonical servers, and then with snap repositories under control of the corporation.