Unable to share clipboard between host and guest

[ThinkingFast]

VirtualBox 4.1.20
Windows 7 Pro host
Ubuntu 12.04 LTS guest
Fedora 17 guest

I have installed Guest Additions. I have enabled the Share Clipboard option in each virtual machine's general settings, and set that to "Bidrectional."

I have rebooted my guests several times.

In Ubuntu, I have installed dkms. In Fedora, I have installed gcc. Both of these steps are from Chapter 4 of the VirtualBox manual found online.

What else can I do to get this working?

Thanks

[mpack]

Provide a VM log file please, preferably zipped.

[ThinkingFast]

Attached.

Thank you!

[Perryg]

While the guest additions are mounted, the log does not show it as installed.
This should help Howto: Install Linux Guest Additions

[ThinkingFast]

Very nice, the online manual I was using must have been outdated, as it didn't mention installing a handful of those packages.

Works now, thanks!