Install doublecmd-help-ru by entering the following commands in the terminal:
sudo apt update sudo apt install doublecmd-help-ru
Description:
Documentation for Double Commander (Russian)
This package contains the documentation files for the Double Commander designed to be viewed in an external web browser. . This package contains the Russian documentation.
Homepage: http://doublecmd.sourceforge.net/
Version: 0.8.0-1
Section: universe/doc