Package wbm-virtual-server-5.02-1.noarch.rpm is not signed

Howdy -- thanks for your report.

Is this in Virtualmin Pro or GPL?

I am having same issue with Virtualmin Pro 5.0.1:

Building complete list of updates ..

Now updating wbm-virtual-server ..

Installing package(s) with command /bin/yum -y install wbm-virtual-server ..

Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
* base: mirror.compevo.com
* epel: mirror.oss.ou.edu
* extras: mirror.oss.ou.edu
* updates: centos.firehosted.com
Resolving Dependencies
--> Running transaction check
---> Package wbm-virtual-server.noarch 2:5.01-1 will be updated
---> Package wbm-virtual-server.noarch 2:5.02-1 will be an update
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
Package Arch Version Repository Size
================================================================================
wbm-virtual-server noarch 2:5.02-1 virtualmin-universal 13 M
Updating:

Transaction Summary
================================================================================
Upgrade 1 Package

Total size: 13 M
Downloading packages:

Package wbm-virtual-server-5.02-1.noarch.rpm is not signed

.. install failed!

No packages were installed. Check the messages above for the cause of the error.

Try it again. You'll likely need to flush the yum (or dnf) cache with:

yum clean all