当我尝试用rvm更新ruby版本时:rvm install ruby-2.4.0Searching for binary rubies, this might take some timeNo binary rubies available for: ubuntu/12.04/i386/ruby-2.4.0.
Continuing with compilation.Installing Ruby from source to: /usr/local/
-2-2.el7.centos.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID f4a80eb5: NOKEY
The GPG keys listed for the "Foreman 1.16" repository areFailing package is: centos-rel