I couldn't install SEP

I couldn't install SEP 12.1.6, in UBUNTU 14.04, because the java version.

The installation script claims for java v1.5 or later.

The actual java is 1.6 and I tried to install 1,7 and 1.8 (JDK), but didn't worked. They continuing asking for 1.5 or later.

The actual is 1,8 (JDK). Typing #java -version.

I am using 64 bits version.

I received a n web site discribing the issue, but didin't accomplish.

Any ideas ?