If you are migrating from a previous version of WebSphere® MQ for Linux®, you must uninstall your current version before installing WebSphere MQ Version 6.0. See WebSphere MQ for Linux Version 6.0 Quick Beginnings for instructions.
The use of RPM upgrade tools to migrate directly from one version of WebSphere MQ to another is not supported.
If you have already tried to upgrade WebSphere MQ using rpm -U or rpm -F, you might have deleted your old WebSphere MQ package entries from the RPM database without removing the product from your system. You might also have partially installed WebSphere MQ Version 6.0.