Unable to download data from http://rubygems.org/

Question

I wanna export xlsx excel file using ruby in ROR so i'm install rubyXL. i use this command: sudo gem install rubyXL --source http://rubygems.org and then it have error like below

ERROR:  Could not find a valid gem 'rubyXL' (>= 0), here is why:
          Unable to download data from http://rubygems.org/ - Errno::ETIMEDOUT: Connection timed out - connect(2) (http://rubygems.org/latest_specs.4.8.gz)

Please help me

Answer 1

使用命令指定源，

    gem install <gem_name> --source http://rubygems.org

Answer 2

尝试更新rubygems并重试。

gem update --system

Answer 3

Disabling ipv6 solved the issue for me:

https://www.configserverfirewall.com/ubuntu-linux/ubuntu-disable-ipv6/