Can't install displaylink-driver on Ubuntu 22.04

[Many]

My USB to DVI adapter was working just fine until about 2 weeks ago when I had to take my laptop with me on a trip. When I got back I hooked it up only to find my extra display connected through DisplayLink is now blank with no signal.

Just like peterau I have tried to follow the less than helpful (for a non geek) instructions at

https://www.synaptics.com/products/d...wnloads/ubuntu

to no avail. See the attached text file which contains a copy from my latest effort using the command line.

Toshiba SATELLITE L755
Ubuntu 22.04.3 LTS x86_64
Kernel: 6.2.0-26-generic

If I boot into Windoze 7 everything works just fine so the hardware is okay.

I have spent two whole days on this... Please help.