This a bit of dark ubuntu magic. Actually it means: 'right now you don't have "javac" installed', but it also gives you some hints how to get one (ie installing one or of those packages. (I'd offer direct download from Sun/Oracle
, and install it under /opt. (Requires a bit experience in-linux administration though.)))
PS: if your aren't root-user on that computer, don't try to install/download anything, contact the help/support/administrator.