I've installed the guest additions on my Debian Linux virtual machine. Installation went through without any problems.

For some reason I still can't get the option to run in seamless mode (it's greyed out). VirtualBox is running on Mac OSX.


Solved my problem. Make sure dkms is installed in the guest OS (following command for Debian Linux):

sudo apt-get install build-essential linux-headers-`uname -r` dkms

Then re-install Guest Additions.

  • 1
    Not a biggie, but I thought I'd mention that I did have to restart the Guest after following these steps. – tekNorah Sep 23 '15 at 21:44

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