Well, before Christmas I was updating some software in my Ubuntu 12.04 installation, where I have happily installed TeX Live 2013 since last summer (I did it from an ISO image downloaded from the CTAN). I found yesterday in the software center a interesting program called QTikZ and I want to try it. But it crashed and produced an error. The attempt of installation also installed an old TeX Live version from 2009 that now crashes every time I update, uninstall, or install something. So I uninstalled QTikZ and some software, longtime unused, but the error remains.
I remember three posts about install TeX Live 2013 and what to do before:
So my question is what to do for uninstall TeX Live 2009 without break or loose TeX Live 2013?
Merry Christmas for everybody and in advance thanks you all.