Well I'm running out of ideas! Maybe try a fresh installation of 20.04, either in a VM or a spare partition, and see what happens?

I have the same issue. I'm on a fresh install of Kubuntu 20.04, it's the first thing I try to install...

Mine was upgraded from 19.10, which may mean some libraries are present that are not in a fresh install. Have you tried installing build-essentials before running the install?

Thank you for your idea,
The apt install command did not change anything...

If I can't find a solution before tonight I'll go back to the 18.04 and wait sometime before upgrading...

If it helps at all the "displaylink-debian" solution referred to in previous posts seems to work fine for most people (though you may need to tweak your Xorg.conf a little)...maybe try that before ditching 20.04?

I only signed up to DisplayLink driver update alert emails yesterday. Got the one about 5.3 this morning. Ran the installer and happy happy joy joy.
Had previously tried the debian one, but uninstalled a couple of days back when I gave up trying to get it to work. If there's any logs/config anyone wants to see from my working install, let me know.

same problem with libdrm

Unfortunately displaylink-debian now try to install the v5.3 so i get the same libdrm issue.

Btw even on ubuntu 18.04 with the 5.2 I have to tweak a Xorg.conf file.

I ran into the same issue(displaylink-debian downloading 5.3) but it can be easily fixed by replacing head -n 1 on line 21 and 23 of displaylink-debian.sh with so the script grabs the second download link. Works for me, finally got my 2 displays working. 5.3 didn't work at all for me.

Probably worth submitting a bug report to DisplayLink as this seems to be affecting quite a few people...