Creating Compiere PATHS in Ubuntu:

Unlike RedHat, ubuntu does not have a .bash_profile file. To setup ubuntu COMPIERE_HOME, JAVA_HOME and CLASSPATH in ubuntu:

sudo gedit /etc/environment

then add the lines:
COMPIERE_HOME="/home/ < user > /Compiere2"
JAVA_HOME="/usr/lib/jvm/java-6-sun-1.6.0.06"
CLASSPATH="/usr/lib/jvm/java-6-sun-1.6.0.06/lib"

sudo update-alternatives --config java  :: select an alternative java ver

java -version   :: java version