I think this issue started to occur with KDE neon 5.21. I load SD cards on my laptop, but the system simply doesn't see them. I generally get around the problem by loading multiple cards one by one before the system finally recognises one. Once it recognises one it suddenly recognises them all...

Anyone else with this issue? Thanks.

Operating System: KDE neon 5.21
KDE Plasma Version: 5.21.2
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2
Kernel Version: 5.4.0-67-generic
OS Type: 64-bit
Graphics Platform: X11
Processors: 4 × Intel® Core™ i5-6200U CPU @ 2.30GHz
Memory: 7.7 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 520

I'm on 5.21.5 now and the problem seems to have fixed itself. I don't know when this occurred. Cheers.