Recursive Dependencies -- Help Needed!

I've been using Ubuntu Linux exclusively for the past week now, and so far I'm loving it. But now I seem to have run into a problem with no solution. But then again, I'm a newbie, so it may be an easy thing to fix.

I wanted to install NVU, a WYSIWYG html editor for Linux, but it required the xlibs devel package. So I got that package from ubuntu's site, and I was in the process of installing all of its many dependencies, when I came upon a dependance, or rather a recursive dependency.

I start to install libx11-dev, and it tells me I need libxi-dev first. Ok, no problem. I download libxi-dev and it tells me I need libx11-dev. It seems rather strange to me that two programs could be dependent upon each other. Is there some way I can install them simultaneously? I mean, I'm really at a loss for what to do. Here's the exact text I saw when I tried to install each dependency.

did you try installing them simultaneously? i know you can do this with rpm's but ubuntu never liked my pc much so i never liked it much so i've spent about a total of 5-6 hrs in it :] but i'd assume the command would just be:

why not do an apt-get? it takes care of all the dependencies for you. im guessing when you install ubuntu by default you only have access to the stable repository fix this by going to /etc/apt there is a file in there where websites apt checks is stored. whatever the default url is type it exactly in a line below but replace stable with unstable. the unstable repository gives you access to more up to date files and just a lot more things you wouldnt normaly have access to in the stable repository. im telling you this just incase the apps your looking for arent in the stable repository.

apt-get update = to encorperate the unstable repository

apt-cache search app_name = to make sure you get the exact name of the app your looking for as it is stored in the repository

apt-get install app_name_in_repository = to install the app you want including all dependencies if any.

if you need me to clarify anything just ask