You will get more/better responses if you move your post to the linux forum > The specified item was not found.
Download all 4 .deb packages in one directory for your Ubuntu version.
Open terminal -> cd /path/to/directory/which/contains/the/files -> sudo dpkg -i *
You could also do sudo dpkg -i fglrx*.deb
"sudo dpkg -i *" tries to install everything in that directory. All 4 packages need to be installed in order to work.
Reboot and should work.