Install abr2gbr by entering the following commands in the terminal:
sudo apt update sudo apt install abr2gbr
Description:
Converts PhotoShop brushes to GIMP
abr2gbr is a tool for converting Adobe PhotoShop ABR and Corel Paint Shop Pro JBR brush files to the GIMP GBR format.
Homepage: http://www.sunnyspot.org/gimp/tools.html
Version: 1:1.0.2-2ubuntu2
Section: universe/x11