We have 15 debian linux 3cx installs, and recently 4 of them are failing to update when we try to install SP2. They email us the following error message: E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem. Rollback to 15.5.3849.1... E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem. I ran this command on the local linux console logged in as root. sudo dpkg --configure -a This spit out some output that had errors in it, but the update still will not install. Output from sudo dpkg --configure -a: sudo dpkg --configure -a Setting up wireshark-common (1.12.1+g01b65bf-4+deb8u11) ... debconf: unable to initialize frontend: Dialog debconf: (Dialog frontend will not work on a dumb terminal, an emacs shell buffer, or without a controlling terminal.) debconf: falling back to frontend: Readline debconf: unable to initialize frontend: Readline debconf: (This frontend requires a controlling tty.) debconf: falling back to frontend: Teletype Configuring wireshark-common ---------------------------- Dumpcap can be installed in a way that allows members of the "wireshark" system group to capture packets. This is recommended over the alternative of running Wireshark/Tshark directly as root, because less of the code will run with elevated privileges. For more detailed information please see /usr/share/doc/wireshark-common/README.Debian. Enabling this feature may be a security risk, so it is disabled by default. If in doubt, it is suggested to leave it disabled. Should non-superusers be able to capture packets? Use of uninitialized value $_ in join or string at /usr/share/perl5/Debconf/DbDriver/Stack.pm line 111. Use of uninitialized value $val in substitution (s///) at /usr/share/perl5/Debconf/Format/822.pm line 83, <GEN6> line 1. Use of uninitialized value $val in concatenation (.) or string at /usr/share/perl5/Debconf/Format/822.pm line 84, <GEN6> line 1. Processing triggers for libc-bin (2.19-18+deb8u10) ... Setting up tshark (1.12.1+g01b65bf-4+deb8u11) ... We had been told to install tshark previously by a 3cx support rep to troubleshoot call quality a while back so i suspect thats why that part is in there. the command sudo dpkg --configure -a no longer gives any output now.