If you need to install the “Apply Transform” Extension for Inkscape to easily … apply transforms (Duh.) on Linux you just need to execute this command and it will download the Inkscape extension scripts and deploy them straight to the global Inkscape extension directory:
sudo wget https://raw.githubusercontent.com/Klowner/inkscape-applytransforms/master/applytransform.inx -P /usr/share/inkscape/extensions/ && sudo wget https://raw.githubusercontent.com/Klowner/inkscape-applytransforms/master/applytransform.py -P /usr/share/inkscape/extensions/