i download the ruby-2.3.0.tar.gz ,put it in /tmp/ruby-build..... solve this

have u ever solve the problem？I met the problem now.can u give me some advise

I'm currently facing the same issue :( as well.

Same here ... why is it closed without a solution???

Sorry there is no much information in here. This isn't really a problem with rbenv. The ruby-build plugin (the component of rbenv that downloads & installs Ruby) needs either curl or wget to download files. These programs must be working on the system. If there is an error, such as one with curl here, it is likely a network error, or an error with configuration of SSL certificates on the system. In either case, there is not much we can do about that from either rbenv or ruby-build.