Let's assume the OP asks something regarding an issue or a plain question without any suggestion towards a solution to how.
Add repositories to synaptic
I would like to synaptic to have access to the repository files on this website: http://www.tug.org/texlive/debian.html
I have tried typing in the web page in the appropriate place, but that does not seem to work.
There is a further problem: When I do the apt-get install texlive it goes right to the 2009 version. If I add the 2012 version on the website, does that mean that it wont work with 12.04?
Clearly, the OP expects to get TeXLive 2012 by adding a repository being the informative web page. This is not the case, it's just an informational page stating how to get it compiled and what versions are available in which distributions.
Then, a good answer came in:
The directory listing linked on the page you linked does not show the available backports for 12.04(precise).
In order to get the "2012" version of texlive, you will need to add the backport repository from here.
While this isn't the only way to get TeXLive 2012, it's a good (maybe even best) option. I even upvoted it for this reason.
But them some time later the answerer edited the question specifically targeted to his answer:
How do I add the latex backport PPAs to synaptic in 12.04?
body still the same
I'm very ashamed that I clicked "approve" too quickly in reviewing the suggested edit!
Is this still a fair game being played? Other options, like including Quantal repositories and appropriate pinning, compiling from source, etc. are out of the question.
I've put my opinion in an answer.