A simple guide + script to install Scratch 2 on Ubuntu.
For the latest Scratch etc.: https://scratch.mit.edu/
Edit install_scratch.sh to have the proper folders etc. In terminal, go to scratch folder. Then:
chmod +x ./install_scratch.sh
./install_scratch.sh
And follow popup instructions.
Note: This is for 32 bit linux only. for 64 bit install_scratch_64.sh might work, but have not tested it