The script was originally written of elementary OS Luna, and Ubuntu 12.04. If you're running 14.04, some of those steps are downright harmful, and others simply unnecessary. Examples being:
precise repositories in
/etc/apt/sources.list - use
trusty if you have to muck around in there. Or the Software Sources GUI.
- Deleting the backup of the
sources.list (what sort of guide does that?)
- Adding PPAs for GIMP, GNOME3 and VLC. All three are in very good shape in Ubuntu 14.04, with no reason for an average user to go gunning after PPAs.
- Adding PPAs for Java. Java 7 is available for Ubuntu 14.04.
libdvdcss from the VLC repository (see this answer).
flashplugin-installer - I suggest
adobe-flashplugin instead, which comes as a single package instead of downloading extra stuff from the internet.
Lastly, if you do install Google Chrome from the command line using the commands from that page, be sure to run
sudo apt-get install -f after.