Ubuntu: Unable to mount VirtualBox Guest Additions as a guest (Win7 host) The Question: I keep getting this error dialog with an Unable to mount error E_FAIL
( 0x80004005 ) when I try to mount Guest Additions:
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I tried the Force Unmount, but that just closes the dialog with no action
taken. If I then reattempt to mount Guest Additions, I just get this same
dialog box again. Any help would be greatly appreciated!
Solutions Sample (Please watch the whole video to see all solutions, in order of how many people found them helpful):
== This solution helped 34 people ==
Finally, I figured it out. Here is how you get arount this. First, load Disk
Utility and manually eject the disk in the CDROM, by clicking on the Eject
button, after selecting the CDROM device. Then try to remount Guest Additions
using the key combination Host + D and voila, Guest Additions should mount
successfully.
== This solution helped 2 people ==
I had to add one more step.
1. Unmount Volume
2. Eject
3. Rerun Install Guest Additions
== This solution helped 11 people ==
I could not get the autorun to work, installed manually by doing:
cd /media/VBOXADDITIONS_4.2.4_81684/
sudo sh VBoxLinuxAdditions.run
== This solution helped 4 people ==
Unmounting the volume on devices -＞ CD -＞ Remove disk from virutal drive
This will show the "Remove disk from Virtual drive" option as disabled on the
same page once you clicked.
Then Press Host (Keyboard:Right Ctrl) + D i.e Host+D
This started working installing automatically on my Ubuntu screen.
== This solution helped 1 person ==
I ran into this error under this scenario.
1. Turned on Fedora 18
2. Opened Terminal, Logged in as root
3. Attempted to install Guest Additions. It failed with a package missing
error
4. Installed the package and rebooted the system
5. Logged in as guest user and attempted to run Guest Addition, as I was
thinking logging in root is not necessary
No matter how many tries I did, I kept on running into VERR_PEM_MEDIA_LOCKED
error.
Trying to install by logging into root made this error go away.
So, it seems the OS somehow remembers the user you tried to run the Guest
Additions first time, and in successive runs, if you are not logged as that
user, it complains.
== This solution helped 25 people ==
I came across this today and it seems it could not be fixed via GUI operations.
So I did it via command line. It worked like a charm!
1. Devices -＞ Install Guest Additions...(it's like insert a cd to cdrom
drive)
2. Open a terminal to login the guest machine
3. Type below
sudo mkdir --p /media/cdrom
sudo mount -t auto /dev/cdrom /media/cdrom/
cd /media/cdrom/
sudo sh VBoxLinuxAdditions.run
4. You now can do full screen, shared folder, clipboard sharing, etc
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