It already enters a standard java directory in /usr/lib/jvm/ but cannot find jdk in any folder within this directory
From what I understand, and saw in the image, this folder contains the JRE and not JDK. Which distro you are using?
– adelmo00
Linux version 3.19.0-56-Generic (buildd@lgw01-10) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) #62~14.04.1-Ubuntu SMP Fri Mar 11 11:03:15 UTC 2016
– Andrey França