Double Commander – Cannot load library libunrar.so! Please check your installation.
– install build-essential package
apt install build-essential
– download UNRAR source file
http://www.linuxfromscratch.org/blfs/view/svn/general/unrar.html
– extract source file into a new folder
– navigate to the new folder abd run the following command to create the libunrar.so file
# make -f makefile lib
– run the following command to install the libunrar.so file in /usr/lib/
# make install-lib
install libunrar.so /usr/lib
install libunrar.a /usr/lib
– open Double Commander and try to open RAR file