This SHOULD work on the latest MBLDUO firmware as well
Connect to the MBL with PuTTY or Terminal and install optware
wget http://mybookworld.wikidot.com/local--files/optware/setup-mybooklive.sh
sh setup-mybooklive.sh
Issue the following commands to ensure that we can use the command “ipkg” from any directory
echo "export PATH=$PATH:/opt/bin:/opt/sbin" >> /root/.bashrc
echo "export PATH=$PATH:/opt/bin:/opt/sbin" >> /etc/profile
Close PuTTY or Terminal (Very Important)
Open PuTTY or Terminal and connect to the MBL again
ipkg update
ipkg install mc
From PuTTY or Terminal type
mc
Done!