The Ruby Version Manager RVM is one of the key components in a Ruby development environment on non-Windows platforms.
Yesterday I wanted to install it on my Ubuntu laptop. The recommended way of doing is to run the following command in a terminal:
curl -L https://get.rvm.io | bash -s stable
Unfortunately this gave SSL certificate verification errors. Visiting rvm.io in Firefox and Chrome indicated that this was due to the site's security certificate having expired.
A little Googling revealed the recommended workaround which is to use Gihub instead of rvm.io:
curl -L https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer | bash -s stable