I'm still running Ubuntu 12.04 and I would like to manually install the most recent texlive. One of the first steps for the manual installation is to get rid of existing installations of texlive. However, I want to keep my default texlive installation from the Ubuntu repositories, since I have a huge number of LaTeX documents, which sometimes may rely on version-specific modifications.
Therefore my question is how to use a native texlive installation (or possible multiple) in parallel to the installation from the Ubuntu repositories? What steps in the manual installation change in order to account for an existing installation? And how do I tell my system which texlive distribution I want to use?
I think answering this question will probably answer all my related questions as well, like for instance: Is the current distribution only determined by the executables which are currently in the
PATH? And if so, how can I quickly switch between the distributions? It looks like the texlive binaries in
/usr/bin are not symlinks but real binaries, so I'm not sure how I can hide their existence without deleting them. And what may also be challenging: How can I find out all binaries that belong to a texlive distribution (pdftex, pdflatex, luatex, xetex, …)? Will changing the distribution automatically affect build systems/editors (like rubber/latexmk/eclipse/gedit) as well, or is it necessary to make manual changes each time?