firstly ,we can install the latest version of ruby through ruby`s official site, $./configure $make $sudo make install ,this is three cmd to install the ruby source code,as well as other c source code.
secondly, we can install rails through cmd $ sudo gem install rails. we can check it by cmd $ ruby -v $rails -v
thirdly, bundler, by $sudo gem install bundler
lastly, the most important that offcial site did not mentioned , install a javascript runtime ,such as $sudo apt install nodejs
until now ,we can use rails $rails new blog $bundle install $rails server to check our installation.