It’s old but works. So no retirement and no waste.
22.04 on that machine works from usb live session.
22.04 installed from scratch on that machine also works ( if you don’t enable third party installer in ubiquity which replaces nouveau by nvidia driver ) - by chance I had set that dual boot few weeks ago ( that one ).
So I really think here it’s a setting / driver / software issue after upgrading from 20.04 to 22.04.
Even if I’ve been stupid enough to do that on a production machine I had checked before : updates, ppa, available space, live session. Data are safe, synchronized with other machines and backup’ed. So I’d really like to dwelve into that particular session.