This is a simple TeX Live 2010 installation guide from Ubuntu 10.10 via iso file.

1.) Download TeXLive 2010.iso from here

2.) on Ubuntu install perl-tk package for a GUI installation.

Use this command in Applications -> Accessories -> Terminal:

sudo apt-get install perl-tk

3.) Mount the iso:

sudo mount -o loop texlive2010*.iso /mnt

Go to the mount directory and start installing in GUI:

cd /mnt
sudo ./install-tl --gui

4.) After installation, it prompts something like this:

Add /usr/local/texlive/2010/texmf/doc/man to MANPATH.
Add /usr/local/texlive/2010/texmf/doc/info to INFOPATH.
Most importantly, add /usr/local/texlive/2010/bin/x86_64-linux
to your PATH for current and future sessions.

Edit /etc/bash.bashrc via:

sudo vi /etc/bash.bashrc

add following in the end:

PATH=/usr/local/texlive/2010/bin/x86_64-linux:$PATH; export PATH
MANPATH=/usr/local/texlive/2010/texmf/doc/man:$MANPATH; export MANPATH
INFOPATH=/usr/local/texlive/2010/texmf/doc/info:$INFOPATH; export INFOPATH

Edit /etc/manpath.config via:

sudo vi /etc/manpath.config

under following :

# set up PATH to MANPATH mapping

add this line:

MANPATH_MAP /usr/local/texlive/2010/bin/x86_64-linux /usr/local/texlive/2010/texmf/doc/man