How to start local ActiveMQ (build from source) on Ubuntu when the ActiveMQ package has previously been installed

This is the frustration of the day. I downloaded the ActiveMQ source and compiled it with no issues – however I could not start ActiveMQ (using ./activemq start) and the console output did not really explain what was wrong: ./activemq: 344: ./activemq: “/usr/bin/java” -Djava.util.logging.config.file=logging.properties -Djava.security.auth.login.config=/home/MY_USER/git/activemq/assembly/target/apache-activemq-5.12.1-SNAPSHOT//conf/login.config -Dactivemq.classpath=”/home/MY_USER/git/activemq/assembly/target/apache-activemq-5.12.1-SNAPSHOT//conf:/home/MY_USER/git/activemq/assembly/target/apache-activemq-5.12.1-SNAPSHOT//lib/” -Dactivemq.home=”/home/MY_USER/git/activemq/assembly/target/apache-activemq-5.12.1-SNAPSHOT/” -Dactivemq.base=”/home/MY_USER/git/activemq/assembly/target/apache-activemq-5.12.1-SNAPSHOT/” -Dactivemq.conf=”/home/MY_USER/git/activemq/assembly/target/apache-activemq-5.12.1-SNAPSHOT//conf” -Dactivemq.data=”/home/MY_USER/git/activemq/assembly/target/apache-activemq-5.12.1-SNAPSHOT//data” -jar “/home/MY_USER/git/activemq/assembly/target/apache-activemq-5.12.1-SNAPSHOT//bin/activemq.jar” : not found […]