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Ctrl+Q
Gimp (GNU Image manipulating program) is equivalent to Photoshop in Gnu/Linux distributions.
Open your image in Gimp then from "File" menu select "Export as",...
TL;DR
For everything to work and not only your browser, you need to add that CA certificate to the system's trusted CA repository.
In ubuntu:
I do this sort of thing all the time. Some tips:
system-config-lvm
...
You probably installed with legacy mode and your computer doesn't know about legacy, it tries to boot in UEFI mode and searches for a UEFI/EFI partition. If it doesn't find a UEFI partition then...