The problem seems to be that the command "gksudo" is not present in a fresh install of Ubuntu 13.04. It needs to be installed with "apt-get install gksu". Then MAGICK-INSTALL works.
The problem seems to be that the command "gksudo" is not present in a fresh install of Ubuntu 13.04. It needs to be installed with "apt-get install gksu". Then MAGICK-INSTALL works.