06-22-2021, 07:33 AM
No, Gribouille, the information on the wiki is out of date, as Mobian no longer contains the mentioned file or a file with similar details that can be changed. I assume that some changes were recently made to make Mobian closer to Debian Bullseye, but the devs have not provided updated instructions for enabling Mobian unstable. (Perhaps now, with the release of Bullseye, "Mobian unstable" will simply be plain Debian unstable, but I don’t know.)