We currently have Zimbra 8.0.3_GA_5664 (build 20130305090205). When we tried to upgrade the server to 8.0.5 we got an error stating "MISSING: pax does not appear to be installed." Server is running Ubuntu LTS Lucid. Our data center has no idea what pax is, do we need pax or can we ignore it? Any advise would be a great help.