No, that did not work either. It only recommends one for my nVidia GeForce GT 710 card (GK208B driver). I am perfectly happy with the distro builtin xserver-org-video-noveau driver for now.
Anyway, even if it did, without Internet access I cannot access the APT database, not even to install the...
No, I have tried that.
Actually, I can, but the only other box I could connect to is a small notebook (a Toshiba NB505) that's so old and has so little memory that I disabled the ethernet port to save some, and now I cannot use it since I totally forgot how to re enable it.
The network card is a TP-LINK TL-WN881ND. I have previously used it successfully on that same computer under Ubuntu 19.04, but when I upgraded it it ceased to work.
I have the CD that came with the card. It simply directs Linux users to the company website, which then directs you to compile...