First error solved you must input: Code: dpkg -i /home/user/MyDocs/Downloads/hss.deb The / before home is missing in your command... I'll look thru' for the second error now... For your second error can you try as root in terminal: Code: rm -rf /var/lib/apt/lists/lock Do a reboot then apt-get update in terminal as root...
dpkg -i /home/user/MyDocs/Downloads/hss.deb
rm -rf /var/lib/apt/lists/lock