You can open an application called synaptic (problem within the system menu) and then edit the software repositories your computer accesses. There are probably some repositories like ubuntu universe that you can check off to include. This may clear up the dependency problems you have, as those dependencies will now be in a repository you can access.
These webpages may be of assistance:
Here is a "hebrew"ized remastering of ubuntu. Since it is based on the recent 7.10 release, you can probably boot it in live-evalution CD mode if you don't want to overwrite your current ubuntu installation. That way, you can do all your assignments using the hebrew support. You should also be able to access your hard drive while using the live-evaluation CD if you go to your equivalent of "my computer" and right click or something to enable hard drive access by the live-evaluation CD. You can surf, compose stuff, and print using the live-evaluation CD. You can also access any USB thumb drives you have to store and retrieve information.
Also try posting to justlinux.com. They are extremely competent, but make sure you post with a meaningful subject header. They are known to be a bit less patient with people then linuxquestions.