我正在运行 ubuntu 12.04,尝试安装时出现以下错误。我该如何解决?我如何获得 ruby 1.9.1?这就是我在ubuntu上安装的方式
sudo apt-get install ruby ruby-dev libopenssl-ruby rdoc ri irb build-essential wget ssl-cert
sudo apt-get -y install rubygems
sudo gem install knife-windows --include-dependencies
INFO: `gem install -y` is now default and will be removed
INFO: use --ignore-dependencies to install only the gems you list
ERROR: Error installing knife-windows:
gssapi requires Ruby version >= 1.9.1.