tlmgr is the TeX Live Manager and responsible for the TeX installation on your (Linux) machine.
If you're getting the message:
(running on Debian, switching to user mode!)
cannot setup TLPDB in /home/dominik/texmf at /usr/bin/tlmgr line 5336.
... tlmgr has not been initialized. Run this to initialize it:
tlmgr init-usertree
Then, you may set e.g. a global paper size standard: tlmgr paper a4.
Posted by Dominik Schöler to makandra dev (2014-11-12 16:58)