You can download archives of the jpeg-ijg libraries directly from the Independent JPEG Group here
Our 3.0.x SDK uses an older version of wxWidgets that brings in this old library…
On Debian/Buster: one also need " libwebkitgtk-1.0-0" and "libjavascriptcoregtk-1.0-0" (which I haven't succeeded to "forward-port" from Strech yet)
Garmin: why don't…
I just installed on Debian 11. My notes for working around the dependency issues for SDK Manager can be found here. I did two things. First I added the old 'stretch' distribution of Debian to apt so I could resolve the libwebkitgtk dependency cleanly. For the other problematic dependency, libjpeg8, I downloaded the package from an archive of 'wheezy'. The links are all included in my notes.