Install texlive 2012/2013 on Ubuntu 12.04

From repository

sudo add-apt-repository ppa:texlive-backports/ppa
sudo apt-get update
sudo apt-get upgrade

Manually installation

1. follow instruction on http://www.tug.org/texlive/quickinstall.html
2. if you download iso file, mount the file first, then run ./install-tl --location iso_path
3. you may need to install perl-tk inorder to run the GUI installer ./install-tl -gui
4. if you are using texmaker, you need to change the “ADD to PATH” to “path_to_your_installation:$PATH”