Earlier quoted context omitted.
AppImages are only as self-contained as the author put effort into making them self-contained. There's also upper limits to how self-contained they are. While some terminal and bitmap only X11 app can be compiled as static binaries, anything that depends on system libraries needs to be compiled with an older version of glibc. The best example is libGl (GLX or EGL) for hardware 3D acceleration or libvdpau for hardware…
Interesting. Yeah it seems like the solution for digikam on my solution was something like unpack the app image and recompile something and I’ve not had the time to mess with it. I hope the maintainer can release a fixed image at some point. I really like that app!
[0] https://packages.ubuntu.com/search?keywords=digikam