ERROR: cannot start RubyMine. No JDK found. JDK Version? + desktop link

Question

ERROR: cannot start RubyMine. No JDK found. Please validate either RUBYMINE_JDK, JDK_HOME or JAVA_HOME environment variable points to valid JDK installation.

I'm not sure what JDK version number to use to download it?

Also how to create a desktop link in 11.10?

Answer 1

I think using apt-get is easier, see for example this article:

sudo apt-get install openjdk-7-jdk