Installing Rapidminer in ubuntu

Hi,

I am having a problem with installing/configuring RapidMiner in ubuntu 17.10, 64-bit. This is what I get when I try to run it:

alicja@alicja-700Z3C-700Z5C:~/rapidminer-studio-8.1.0/rapidminer-studio$ ./RapidMiner-Studio.sh
RAPIDMINER_HOME is not set. Trying the directory '/home/alicja/rapidminer-studio-8.1.0/rapidminer-studio'...
Could not find the java executable in default path or ${JAVA_HOME}/bin/java.
Edit ./RapidMiner-Studio.sh and/or your local startup files.

Could you please help?

Alicja