I got:
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VirtualBox Guest Additions: modprobe vboxsf failed
You may need to restart the Window System (or just restart the guest system) to enable the Guest Additions.
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VBoxClient: VBoxClient (seamless): failed to start. Stage: Setting guest IRQ filter mask Error: VERR_INTERNAL_ERROR
I investigated online, tried adding the user name to the vboxsf groups, and adding kernel-syms through Yast. No luck. However, I found a thread indicating that the openSUSE VM is installing its own guest additions: viewtopic.php?f=7&t=75572 .
I checked for virtualbox-guest-x11 under YAST in the openSUSE VM. Sure enough, it was there.
Is VB 5.2.4 being fussier about the check for existing Guest Additions before installing its own? And is there any need or benefit to going with the Guest Additions ISO from Oracle if the distro is installing its own?
And finally: are more distros now packaging their own Guest Additions? I installed an Antergos and Linux Mint VM awhile back, and noted that they both went full screen by themselves, and already had the functionality that I'd associate with Guest Additions.