Paperclip 'identify' command error on ubuntu.

The Paperclip.options[:command_path] setting is for the location of your ImageMagick executables (in this case identify).

Try running which identify and setting the option to be the directory that is returned like identify is hashed (/usr/bin/identify).
If that command doesn't return anything, make sure that ImageMagick is properly installed.

If not installed then run following command and install it.

sudo apt-get install imagemagick
sudo apt-get install libmagickwand-dev
gem install rmagick

Then set Paperclip.options[:command_path] = "/usr/bin" in development.rb file

Problem solved.