Error in virtualbox while instaling guest additions

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# 1  
Error in virtualbox while instaling guest additions

Failed to open the CD/DVD image /usr/lib/virtualbox/additions/VBoxGuestAdditions.iso.

Could not get the storage format of the medium '/usr/lib/virtualbox/additions/VBoxGuestAdditions.iso' (VERR_NOT_SUPPORTED).

Result Code: VBOX_E_IPRT_ERROR (0x80BB0005)
Component: Medium
Interface: IMedium {53f9cc0c-e0fd-40a5-a404-a7a5272082cd}
Callee: IVirtualBox {c28be65f-1a8f-43b4-81f1-eb60cb516e66}

this was the error message shown by VirtualBox , unable to install guest additions .. pls help

Last edited by DukeNuke2; 04-04-2013 at 09:15 AM..
# 3  
Re: verr not supported

i have checked in

guestaddition.iso is present there .

---------- Post updated at 07:46 AM ---------- Previous update was at 07:45 AM ----------

i have also change their permissions and made them executable . (777) . also tried updating and upgrading the system . still showing the same error.
# 4  
777 is not the magic sledgehammer to fix all permission problems.

Your "iso" file is now writable and executable by everything on the system, you should set it 660 before someone comes along and overwrites it with something nasty.

I suspect it means what it says... that your iso file is not actually an iso. What does this print to terminal? file /usr/lib/virtualbox/additions/VBoxGuestAdditions.iso
# 5  
file /usr/lib/virtualbox/additions/VBoxGuestAdditions.iso: #ISO 9660 CD-ROM filesystem data 'VBOXADDITIONS_4.1.12_77245 '
---------- Post updated at 11:57 AM ---------- Previous update was at 11:55 AM ----------

and change their permissions again to 660 ?
help !!!
# 6  
You don't need to change the permissions unless it tells you "permission denied".

Try downloading it again, maybe it got corrupted.

Perhaps vbox is picky about what kind of ISO it gets (Joliet, Rock Ridge, etc), do you know how this ISO was made?

Perhaps it's from a newer version of vbox than yours?
This User Gave Thanks to Corona688 For This Post:
# 7  
Have you installed the right version of Virtualbox Guest Additions for your particular platform?
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