Failed to load VMMR0.r0 (VERR_SUPLIB_OWNER_NOT_ROOT).

[papampi]

I have a problem starting virtualbox on my ubuntu 11.04 .
install shows no error and i can manage a new virtual but when i'm going to start the new virtual with windows xp it give me error !
I installed and removed many times !
I installed virtualbox-4.0 and 4.1 from terminal and also from synaptic virtualbox-ose all with same result !!!
I searched so much and read many post over the net and i have no idea what i should do to make it work !!!
here is the error when i click the start :

Failed to open a session for the virtual machine Windows XP.
Failed to load VMMR0.r0 (VERR_SUPLIB_OWNER_NOT_ROOT).

Result Code: NS_ERROR_FAILURE (0x80004005)
Component: Console
Interface: IConsole {1968b7d3-e3bf-4ceb-99e0-cb7c913317bb}

i chown root:root /usr/lib/virtualbox/
and this is the output :

payam@PAYAM-UBUNTU:/$ sudo chown root:root /usr/lib/virtualbox/
payam@PAYAM-UBUNTU:/$ ls -ld /usr/lib/virtualbox/
drwxr-xr-x 5 root root 4096 2011-10-11 00:57 /usr/lib/virtualbox/

any idea what should i do to make it run my virtual.

[papampi]

any idea ?????

[skierpage]

I had the same problem. I'm running Kubuntu 11.10 with VirtualBox 4.1.6 regularly updated from Oracle's own .deb file. It turns out, as Googling suggests, my /usr and /usr/lib were owned by user:group 501:501. Weird, I have no idea how this happened. /usr/lib/virtualbox and its contents were owner:group root:root.

So, in a terminal, check by entering:

ls -ld /usr /usr/lib

If it doesn't show "root root", then enter:

sudo chown root:root /usr /usr/lib

After this I retried and I could boot a VirtualBox from my .iso

I hope this helps.