xu@xu-VirtualBox:~$ rvm install 2.3.0
Searching for binary rubies, this might take some time.
No binary rubies available for: ubuntu/18.04/x86_64/ruby-2.3.0.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for ubuntu.
Requirements installation successful.
Installing Ruby from source to: /home/xu/.rvm/rubies/ruby-2.3.0, this may take a while depending on your cpu(s)...
ruby-2.3.0 - #downloading ruby-2.3.0, this may take a while depending on your connection...
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (35) error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure
There was an error(35).
Checking fallback: https://ftp.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0.tar.bz2
No fallback URL could be found, try increasing timeout with:

    echo "export rvm_max_time_flag=20" >> ~/.rvmrc

There has been an error fetching the ruby interpreter. Halting the installation.

即使增加了 timeout 也失败了，之前的步骤全部按照社区教程走的（https://ruby-china.org/wiki/install_ruby_guide） 看报错信息是 SSL 握手失败，但是并没能在网上找到相关的解决方法