I'm trying to setup github-pages on my Ubuntu laptop, and following the guide provided by Github I have to install the bundler package; giving the command ~$ gem install bundler returns me this error. ERROR: While executing gem ... (Gem::Exception) Unable to require openssl, install OpenSSL and rebuild ruby (preferred) or use non-HTTPS sources Then I have installed OpenSSL, launched the command to update software and stuff and tried again to install bundler, but the error kept showing. How can I fix this? Is there any specific command to rebuild ruby making it aware about the fact that openSSL is now installed?