Installing Guest Additions on Ubuntu hangs

[mediocre]

Background info on my 10.04 VM:

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$ dpkg --get-selections | grep dkms
dkms						install

$ dpkg --get-selections | grep essential
build-essential					install

$dpkg --get-selections | grep headers
linux-headers-2.6.32-26				install
linux-headers-2.6.32-26-generic-pae		install
linux-headers-2.6.32-27				install
linux-headers-2.6.32-27-generic-pae		install
linux-headers-2.6.32-28				install
linux-headers-2.6.32-28-generic-pae		install
linux-headers-2.6.32-29				install
linux-headers-2.6.32-29-generic-pae		install
linux-headers-2.6.32-30				install
linux-headers-2.6.32-30-generic-pae		install
linux-headers-generic-pae			install

$ uname -a
Linux john-vm 2.6.32-30-generic-pae #59-Ubuntu SMP Tue Mar 1 23:01:33 UTC 2011 i686 GNU/Linux

When I try to install Guest Additions on my VM, the command hangs on the line "You should restart your guest to make sure the new modules are actually used" without ever returning me to my prompt.

$ sudo ./VBoxLinuxAdditions.run
Verifying archive integrity... All good.
Uncompressing VirtualBox 4.0.4 Guest Additions for Linux.........
VirtualBox Guest Additions installer
tar: Record size = 8 blocks
Removing existing VirtualBox DKMS kernel modules ...done.
Removing existing VirtualBox non-DKMS kernel modules ...done.
Building the VirtualBox Guest Additions kernel modules ...done.
Doing non-kernel setup of the Guest Additions ...done.
You should restart your guest to make sure the new modules are actually used

The VBoxGuestAdditions.log shows:

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Starting the VirtualBox Guest Additions ...done.
Start VirtualBox Guest Addition Service

Which looks to indicate where it might be hanging.

Forcibly rebooting the machine at this point does not result in have GA installed. Nor does repeated attempts at installing the guests additions. Any ideas?

[Sasquatch]

Check the output of 'dkms status'. If you get some output with modules, then you also see the state of the modules. Depending on the state and output, you have to manually add, build or install the modules. If the state is fine, i.e. installed, then you can try to manually load the modules by issuing 'sudo modprobe <modulename>', where <modulename> is vboxhost, vboxsf and vboxadd iirc.