Hello Patrick,
I would just let you know this:
When I installed texlive last autumn, I had the same problem as you told
(no texlive found after launching the installation script):
I had absolutely never installed texlive of any version on my PC, and
followed the directives from:
http://ubuntu-manual.org/getinvolved/authors#install-texlive
But when I tried to generate the Ubuntu Manual, I had an error saying
that I had no texlive installed at all.
In my opinion the problem was that the script never gave me the
opportunity of selecting the “create symlinks in standard
directories” (L)." option, as it is described in the install-texlive
page.
To solve this problem I had to find where this texlive had been
installed on my pc, and then I could add the following lines in
my .bashrc file:
PATH=$PATH:/usr/local/texlive/2012/bin/i386-linux
PATH=$PATH:/usr/local/texlive/2012/bin/i386-linux/tlmgr
export PATH
This work-around allowed me to generate the manual, so I did not make
any further research.
Hope this helps
Regards
Enrico