Get rid of the default Ubuntu repository installed version of ImageMagick.

Just run this sudo aptitude purge command to get rid of any ImageMagick stuff installed via the default Ubuntu repository:

sudo aptitude purge imagemagick

Install the ImageMagick source code prerequisites and dependencies.

Install the basics for the build:

sudo aptitude install build-essential checkinstall libx11-dev libxext-dev zlib1g-dev libpng12-dev libjpeg-dev libfreetype6-dev libxml2-dev

Build the dependencies for the build:

sudo aptitude build-dep imagemagick

Install ImageMagick from source using checkinstall.

First grab a compressed archive from an official ImageMagick source site:

curl -O -L http://www.imagemagick.org/download/ImageMagick.tar.gz

Next, decompress the archive like this:

tar -xf ImageMagick.tar.gz

Now go into the decompressed directory:

cd ImageMagick-*

Run this configure command:

./configure

Finally compile and install it by running checkinstall:

sudo checkinstall

Just punch through the default options presented and any questions that might pop up during the Debian package build.

When all done you will get a message like this on the screen which means ImageMagick is installed:

**********************************************************************

 Done. The new package has been installed and saved to

 /home/sysop/ImageMagick-6.9.3-0/imagemagick-6.9.3_0-1_amd64.deb

 You can remove it from your system anytime using: 

      dpkg -r imagemagick-6.9.3

**********************************************************************

After that is done, you may need to configure the dynamic linker run-time bindings:

sudo ldconfig /usr/local/lib

Finally, check the version number like this:

convert -version

And the output should look something like this:

Version: ImageMagick 6.9.3-0 Q16 x86_64 2016-01-17 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2016 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Features: Cipher DPC OpenMP 
Delegates (built-in): bzlib djvu fontconfig freetype jbig jng jpeg lcms lqr lzma openexr pangocairo png tiff wmf x xml zlib

Uninstall ImageMagick from source using dpkg -r.

Go into the decompressed directory where the initial ImageMagick install happened:

cd ImageMagick-*

And run this dpkg -r command to uninstall it:

sudo dpkg -r imagemagick-6.9.3