
Anyway, I made a fresh installation of Debian 9.5, with Mate as DE. While I'm still recovering after my personal loss, I seem unable to think clearly and I desperately need your help, people. I admit it makes me feel rather ashamed of myself


So, just before this tragedy happened, I bought a new printer, HP LaserJet Pro M12a. While I was still a happy user of Debian 9.4, I managed to make it work with http://foo2zjs.rkkda.com/
Unfortunately, I cannot make my printer work again. I've passed all the steps described on the link above, but I stuck when I get to that web-site. The approach is forbidden, as I get a clear message when I try to write down my user name and my root password. And I don't understand why do I need this web approach at all, because I am the only user of this printer and it's connected with my PC through the USB.
Since I know I managed somehow to install it before, while I was having 9.4, I can't figure out what did go wrong and what do I miss. I am familiar with this topic viewtopic.php?f=7&t=136965&p=669461&hilit=laserjet+pro#p669461 but it did not work for me, as I can't see any settings/print settings. I also downloaded HPlip and HPlip GUI, but it's useless. It does not see the printer, which is connected through the USB port.
Well, before I hang myself (which appears as a better solution, than to throw away this useless piece of garbage called HP LaserJet), I am making this final attempt to ask for your help.