Xeiso code is maintained using Bazaar at Launchpad. To get it, install the bzr package in Ubuntu. You’ll also want Pyglet and SDL for audio. If you have previously installed Xeiso from a Launchpad PPA package, you should already have these.
Once you have both installed, run:
bzr branch lp:xeiso-ui
Next, cd to the branch directory, and start Xeiso:
./xeiso-ui
To run Xeiso in debug mode, simply run
python xeiso-ui
See the README file for details.
If you want to install Xeiso at this state, continue on. However, please remember to remove any Ubuntu or Launchpad PPA packages from your system first, as they will interfere.