installer does not check for gksu dependency

[karlrt]

On a fresh install of ubuntu 16.04, ./MAGICK-INSTALL fails with this console message:

Traceback (most recent call last):
  File "./MAGICK-INSTALL", line 96, in <module>
    usr_for_group + "'"
NameError: name 'sudo' is not defined

EXPECTED OUTOME
it should check for the mission module and advise user to install it, or install the dependency on its own

FIX
sudo apt-get install gksu solves the issue on ubuntu 16.04

[Wolfgang Noichl (w-noichl)]

gksu has been removed in 18.04, and the installer is broken in many other places.

Following INSTALLER.txt by hand just works fine, though :)

[Wolfgang Noichl (w-noichl)]

The project is orphaned here. I forked it on github, https://github.com/wolfgang-noichl/magick-rotation and made it work at least on recent xubuntu.