Preparing to unpack .../gawk_1%3a4.0.1+dfsg-2.1ubuntu2_i386.deb ... Unpacking gawk (1:4.0.1+dfsg-2.1ubuntu2) ... Selecting previously unselected package arno-iptables-firewall. Preparing to unpack .../arno-iptables-firewall_2.0.1.d-1_all.deb ... Moving plugins from /etc to /usr/share/arno-iptables-firewall/plugins. Updating firewall startup behavior -- delayed until network becomes available. Removing any system startup links for /etc/init.d/arno-iptables-firewall ... Unpacking arno-iptables-firewall (2.0.1.d-1) ... Processing triggers for man-db (2.6.7.1-1ubuntu1) ... Processing triggers for ureadahead (0.100.0-16) ... Setting up gawk (1:4.0.1+dfsg-2.1ubuntu2) ... Setting up arno-iptables-firewall (2.0.1.d-1) ... debconf: unable to initialize frontend: Dialog debconf: (Dialog frontend requires a screen at least 13 lines tall and 31 columns wide.) debconf: falling back to frontend: Readline arno-iptables-firewall configuration ------------------------------------ For security reasons the new firewall setup is not applied automatically. You might want to perform a manual inspection of the firewall configuration in /etc/arno-iptables-firewall/firewall.conf, especially when upgrading to a new version, as configuration variables might have changed. In order to later manually apply the new firewall settings before the next reboot, invoke 'invoke-rc.d arno-iptables-firewall start'. [More]   If you do not need manual inspection, the firewall-setup can be applied now. Should the firewall be (re)started now? Y  * Restarting Arno's Iptables Firewall arno-iptables-firewall  ERROR: One or more interfaces specified in EXT_IF is the same as one in  INT_IF! Please, check the configuration file. [fail] invoke-rc.d: initscript arno-iptables-firewall, action "restart" failed. dpkg: error processing package arno-iptables-firewall (--configure): subprocess installed post-installation script returned error exit status 3