We faced this error during Oracle12cR2 installation. During our installation of oracle 12.2 in new home on existing Oracle 11g installation,we faced the error   LOG INFO: Executing [/opt/oracle/product/12.2.0.1/db1/bin/diagsetup, clustercheck=false, basedir=/opt/oracle/product, oraclehome=/opt/oracle/product/12.2.0.1/db1] /opt/oracle/product/12.2.0.1/db1/bin/diagsetup WARNING: java.lang.UnsatisfiedLinkError: /opt/oracle/product/12.2.0.1/db1/oui/lib/linux64/liboraInstaller.so: /opt/oracle/product/12.2.0.1/db1/oui/lib/linux64/liboraInstaller.so: undefined symbol: JNU_ThrowByName WARNING:        at java.lang.ClassLoader$NativeLibrary.load(Native Method) WARNING:        at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1941) WARNING:        at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1824)… Continue Reading Error undefined symbol: JNU_ThrowByName during oracle 12c R2 installation