HOME/bin not a valid identifier

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http://askubuntu.com – Thanks for reading. I am a grad student who has fallen into maintaining a server on a linux-Ubuntu machine - we work in Ontopia and Wandora, two programs that like to mess with Java environments. I am learning as I go which means I probably messed up something stupid; I believe I was trying to update the version of Java that was running on Ubuntu when I broke it. The login page loads, I enter my password, it reloads. This happens for all users, guest, and test accounts. This happens in Ubuntu, Ubuntu2d, lubuntu and after the graphicx failsafe recovery business. Logging in through the (HowTos)