I'm looking for the same... but nothing.. the extra devel is for developers..

I got proftp and dftp... with .deb extension... I tried to install but there are no permissions. when I put root (do I need to execute rootsh?.. or only install it?) there is a message

Nokia-N900-51-1:~# apt-get install proftpd_1.3.2d-1_armel.deb
E: Could not get lock /var/lib/dpkg/lock - open (11 Resource temporarily unavailable)
E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
Nokia-N900-51-1:~#

what do I need to do?