As you found, your brushes go in /home/kjwengel13/.config/Gimp2.10/brushes That is standard regular Gimp 2.10 (a good thing)
What is provided in the way of file managers ? Might be Nautilus or if a 'light' linux Thunar. Regardless, in linux a file or folder starting with a 'dot' as with .config is 'hidden'
There will be an option in a file manager to 'Show hidden files' often a key shortcut is ctrl-h. You can copy/move files using terminal commands (as your screenshot) but as a newcomer to linux you do not really want to go there.
The other thing to note about linux (unlike Windows) is it is case sensitive. A brush grunge.gbr is not the same as Grunge.gbr is different from gRunge.gbr
posted from my Acer C720 chromebook, which is now 6 years old, long ago dumped chromeOS, now runs xubuntu 18.04
What is provided in the way of file managers ? Might be Nautilus or if a 'light' linux Thunar. Regardless, in linux a file or folder starting with a 'dot' as with .config is 'hidden'
There will be an option in a file manager to 'Show hidden files' often a key shortcut is ctrl-h. You can copy/move files using terminal commands (as your screenshot) but as a newcomer to linux you do not really want to go there.
The other thing to note about linux (unlike Windows) is it is case sensitive. A brush grunge.gbr is not the same as Grunge.gbr is different from gRunge.gbr
posted from my Acer C720 chromebook, which is now 6 years old, long ago dumped chromeOS, now runs xubuntu 18.04