/usr/share/tomcat6/lib/catalina-tribes.jar is in libtomcat6-java 6.0.35-1ubuntu3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/tomcat6/lib/../../java/catalina-tribes-6.0.35.jar
/usr/share/tomcat6/lib/../../java/catalina-tribes-6.0.35.jar