ERROR Original Error: ImageMagick/GraphicsMagick is not installed

on Ubuntu:

sudo apt-get install imagemagick

You need to install libmagickwand-dev in order to successfully complete the rmagick gem. Following command will do the job for you:

sudo apt-get install libmagickwand-dev

On a Mac, you would run the following command:

brew install imagemagick # it requires you to install Homebrew first.

I had the same issue and solved it with:

sudo apt-get update

sudo apt-get install imagemagick --fix-missing

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