Both are wrong.
Thanks. I had suspected that there was a better solution.
After a kernel upgrade, you need to reinstall the Guest Additions. When installing them, Kernel modules are created and after a kernel upgrade, they are not available for the new one.
I may need to clarify a couple of things, here:
Guest Additions were
reinstalled in the Kubuntu guest after the kernel upgrade. This is what has me puzzled as it made no difference in performance and Host + G continued to be grayed out while Host + A did nothing useful.
When Kubuntu is the host, as on our other machines, we had to issue /etc/init.d/vboxdrv setup
after a kernel upgrade in order to normalize the kernel with the current VBox level, but the need for doing so vanished after we upgraded to v.1.6.2 and (in Kubuntu hosts) it has been automatic ever since.
Do I need to issue this in Kubuntu when it is a Guest, as well?
If you install DKMS, most of the issues should be solved for this. DKMS will check for kernel modules to be installed when you install a new kernel.
I am not familiar with this program. Is it WIN or Debian? Or an add-on package to VBox? Looks as though I'll need to Google some.
Thanks for your advice.