Thanks for that Micah, it looks like my libreadline5 install was broken and perhaps it was missing from the repos for a short period as I was able to reinstall it just now.
I've included the output you requested below in case you're curious but I believe this issue should now be closed, my mistake. :-( oliver@afidev05:~$ apt-cache policy libreadline5 libreadline5: Installed: 5.2-11 Candidate: 5.2-11 Version table: *** 5.2-11 0 500 http://gb.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages 100 /var/lib/dpkg/status oliver@afidev05:~$ dpkg -L libreadline5 /. /etc /lib /lib/x86_64-linux-gnu /lib/x86_64-linux-gnu/libreadline.so.5.2 /lib/x86_64-linux-gnu/libhistory.so.5.2 /usr /usr/share /usr/share/doc /usr/share/doc/libreadline5 /usr/share/doc/libreadline5/USAGE /usr/share/doc/libreadline5/inputrc.arrows /usr/share/doc/libreadline5/examples /usr/share/doc/libreadline5/examples/Inputrc /usr/share/doc/libreadline5/copyright /usr/share/doc/libreadline5/changelog.Debian.gz /usr/share/doc/libreadline5/README.Debian /lib/x86_64-linux-gnu/libreadline.so.5 /lib/x86_64-linux-gnu/libhistory.so.5 -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to socat in Ubuntu. https://bugs.launchpad.net/bugs/1057573 Title: Socat depends on libreadline5 and fails to link properly. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/socat/+bug/1057573/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs