Install the most important packages using:
sudo apt-get install texlive texlive-latex-extra
optionally also install some German language support packages:
sudo apt-get install texlive-lang-german
If you want the full TeX Live system:
sudo apt-get install texlive-full
Resources
- Official Ubuntu Help: https://help.ubuntu.com/community/LaTeX#TeX_Live
- Ubuntuusers Wiki: http://wiki.ubuntuusers.de/LATEX#TeX-Live (German)
- Package Search for TeX Live: http://packages.ubuntu.com/texlive