Re: FGLRX graphics driver post-release updates won't install
Sorry, but in general, the post-release drive installs do NOT work.
If the "problem" is the enormous delay in getting to a working desktop (you said 45 minutes!), video drivers are not going to be the cause of that.
It's more likely a failing hard drive -- with bad sectors that are forcing massive numbers of re-reads.
Ubuntu 16.10 Mate, Mint 18 Mate; MS Win 8.1, MS Win10 Pro.
Will not respond to PM requests for support -- use the forums.