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The "plugdev" thing is an Ubuntu-only thing after all. Having just installed the latest webex rpm (webex-43.11.0.28947-1.x86_64, build date: Thu 07 Mar 2024 05:06:54 AM EST) I see it has created a new udev rules file. Behold:$ cat /etc/udev/rules.d/7...
RHEL doesn't have a `plugdev` group either. Perhaps it's an Ubuntu-only thing? It would be good to know what it's trying to accomplish. It's a rather annoying message, and doesn't seem to affect functionality.