Paul, IFL GUI 3.12
I also tried these which you suggested last year. No luck.
Open a Terminal and go to a temp/download folder. Then run:
sudo wget http://se.archive.ubuntu.com/ubuntu/poo ... 1_i386.deb
sudo dpkg -i libpng12-0_1.2.54-1ubuntu1_i386.deb
Edit... the error after running the lines on the TeraByte web page was...
E: Unable to locate package libpng12-0:i386