I have tried to copy the icon to /usr/share/icons/hicolor/scalable/apps and called:
gtk-update-icon-cache /usr/share/icons/hicolor/
But it did not work.
I have tried to copy the icon to icons/hicolor/ scalable/ apps and called:
/usr/share/
gtk-update- icon-cache /usr/share/ icons/hicolor/
But it did not work.