Question: So I tried to install ruby through rbenv on my new ubuntu 12.04LTS running on VirtualBox.

I got rbenv from <https://github.com/sstephenson/rbenv> and ruby-build from <https://github.com/sstephenson/ruby-build>. 

and then i run the following but build fails :(

```
rbenv install 2.0.0-p0
Downloading ruby-2.0.0-p0.tar.gz...
-> http://ftp.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p0.tar.gz
Installing ruby-2.0.0-p0...

BUILD FAILED

Inspect or clean up the working tree at /tmp/ruby-build.20130506102349.2564
Results logged to /tmp/ruby-build.20130506102349.2564.log

Last 10 log lines:
installing default gems:      /home/shivin/.rbenv/versions/2.0.0-p0/lib/ruby/gems/2.0.0     (build_info, cache, doc, gems, specifications)
                          bigdecimal 1.2.0
                          io-console 0.4.2
                          json 1.7.7
                          minitest 4.3.2
                          psych 2.0.0
                          rake 0.9.6
                          rdoc 4.0.0
                          test-unit 2.0.0.0
The Ruby openssl extension was not compiled. Missing the OpenSSL lib?

```

Any help would be appreciated. Let me know if you need any more details. Thanks!

Answer: 
You are going to need `libssl-dev`. For best results install all of the [requirements](https://github.com/wayneeseguin/rvm/blob/master/scripts/functions/requirements/ubuntu#L85) which rvm autolibs function will install for you. Some of them (like `sqlite3`) presume that you will ultimately be wanting to install Rails, but aren't harmful if you don't need them.
Most probably you need the openssl extension as a prerequisite :

```
sudo apt-get install openssl

```

should to the trick. Relaunch your RBENV install afterwards.