Silly me, I now realize that graphviz is an umbrella term that spans the broad range of programs in the graphviz family. Simply running commands against text files, for example, to create PDFs from graphs, works. There is no single "graphviz" program.
ORIGINAL POST :::::
Hi guys : I have tried 2 methods for installation of graphviz on kubuntu / ubuntu Linux ubuntu 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux 1) First, I tried using "apt-get". This appeared to work at first. But then, I tried typing "graphviz" at the commandline and get a response. I tried using the --reinstall option, and alas, again I saw nothing. 2) On the website, I tried to download graphviz manually here : http://www.graphviz.org/Download_linux_ubuntu.php. However I get errors regarding missing dependencys. I see that there are many libs associated with graphviz... I tried manually downloading some of them, but in this case, running the installations gave me dependency conflicts of one sort or another, for example : "Error : Breaks existing package libcdt4". Is there a preferred method for installing ubuntu which would be more robust ?