'sudo gem install cocoapods' doesn't work on El Capitan 10.11.4 , ERROR: Could not find a valid gem 'cocoapods' (>= 0) in any repository

Question

Upgrading from Yosemite to El Capitan seem to have wiped out the already installed CocoaPods. When I pod install Alamofire/SwiftyJson, it says \'Pod command not found\'

Answer 1

I faced the same problem and it was fixed by using the following command

$ sudo gem install cocoapods --source http://rubygems.org