Ubuntu Mate - Release 21.04 (Hirsute Hippo) 64-bit
Kernel Linux 5.11.0-25-generic x86_64
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I often run digiKam weekly snapshots (x86-64.appimages) to see what's in development. Up to the 7.3 weekly appimage versions, this always worked on my Ubuntu Mate system.

However, now with the 7.4 weekly versions, the appimages never open -- either via opening the appimage file itself, or via the terminal command (and yes, although the appimages typically are auto-executable, I chmod +x them just to make sure).

When I attempt to run them from the terminal (via "./*.appimage"), I receive the following error messages:

libudev.so.0
libxcb-dri3.so.0
-- Preloading shared libs: :/usr/lib/x86_64-linux-gnu/libxcb-dri3.so.0
digikam: /lib/x86_64-linux-gnu/libnss3.so: version `NSS_3.65' not found (required by /tmp/.mount_digiKangoozw/usr/lib/libsmime3.so)

And so I checked my version of libxcb-dri3-0 -- but my system reports that it is already the newest version (1.14-3ubuntu1).

Separately, my installed libnss3 is also already the newest version (2:3.61-1ubuntu2).

What is causing these errors? What can I do to resolve them?

Thanks