I know this subject has come up quite a few times so far (with different distro's of texlive). See for instance:
Missing tlmgr texlive 2012
tlmgr: TeX Live 2011 is frozen forever
Texlive installation is missing tlmgr, how to fix?
http://the-praise-of-insects.blogspot.com/2011/08/tlmgr-not-available-for-ubuntu.html
http://forums.fedoraforum.org/showthread.php?t=260451
None of them provided a solution that worked for me. The last link implies that the Ubuntu developers decided not to include tlmgr in the texlive distribution.
I installed texlive afresh via the following instructions: https://askubuntu.com/questions/160676/problems-installing-tex-live-2012-on-12-04
My texlive distro apparently lives here: $ whereis texlive: /usr/share/texlive
Any clue where to find tlmgr or how to activate it without reinstalling the texlive distribution all over again?
tlmgrand will never have it. The only way to get it is to install the "vanilla" TeX Live from http://tug.org/texlive – egreg Sep 18 '12 at 22:55tlmgron its own: it is part of a TeX Live installation. If you install from Debian/Ubuntu repositories, you will never havetlmgr. I was just trying to suggest that you don't necessarily need to have it. Many people manage to function just fine without having the most current versions of *TeX packages available, or by simply updating manually the packages they depend on (which is what I do; but regular visitors on this site tend to be the sort of people who want/need the cutting edgetlmgraffords them). – jon Sep 18 '12 at 23:20emacs), so I can't be bothered to trick my system into thinking all the dependencies are satisfied every time I do/install something where it expects the Debian version of TeX Live to be installed. Plus most of the packages I need are updated at most once or twice a year, so it is not difficult to keep up to date. – jon Sep 18 '12 at 23:38sudo apt-add-repository ppa:texlive-backports/ppa; sudo apt-get update; sudo apt-get install texlive; sudo apt-get upgrade– alfC Sep 22 '12 at 01:17tlmgr. – egreg Oct 13 '12 at 15:42