use advice from DrWilken: or if you want use terminal: 1. install rootsh (from repository) 2. open x-term 3. type "sudo gainroot" (or just "root") 4. go to folder where you store package. in this case type "cd /home/user/Documents/" 5. type "ls". You need check file name because you file name contain space after 1 (at least in you post) 6. type "dpkg -i 'scummvm_1 .0.0_armel.deb' ". But if it is contain space will be better rename file name and after this install