ruby on rails installing JSON ubuntu error

Question

Hey I am new to rails (as well as linux) and I keep getting this error:

Installing json (1.7.5) with native extensions 
Gem::Installer::ExtensionBuildError:          


        

Answer 1

Installing the ruby1.9.1-dev package should fix this for you

sudo apt-get install ruby1.9.1-dev

Answer 2

"The same issue on ubuntu-trusty-64 running ruby 2.2.3. the solution is to install libgmp3-dev."

sudo apt-get install libgmp3-dev