Pls follow the instructions from http://grigio.org/pimp_my_gedit_was_textmate_linux

Add-on by Deep Blue (Linux newbie may need this if you are using Ubuntu):

How to install liberation fonts on Ubuntu

commands:
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echo “deb http://ppa.launchpad.net/corenominal/ubuntu gutsy main” | sudo tee -a /etc/apt/sources.list
echo “deb-src http://ppa.launchpad.net/corenominal/ubuntu gutsy main” | sudo tee -a /etc/apt/sources.list
sudo apt-get update
sudo apt-get install ttf-liberation
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My customized Gedit screen snapshot: