I've installed Ubuntu (64-bit version) on a vm through VirtualBox on a Windows 7 64-bit host, but I fear that I've done something wrong. First, when I restart my computer, it just goes straight to Windows 7, as normal. Is there a separate step to have a selection menu at start-up or does this not apply for VirtualBox runs of Ubuntu?
Then, when I go to "Devices-->Install Guest Additions" within Ubuntu (running it by simply starting VB and clicking start on VB GUI for Ubuntu), I get the following error message:
Unable to mount the CD/DVD image C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso on the machine Ubuntu Desktop 12.04 64-bit. Would you like to force mounting of this medium? Could not mount the media/drive 'C:\Program Files\Oracle\VirtualBox/VBoxGuestAdditions.iso' (VERR_PDM_MEDIA_LOCKED).
And I get a choice to "Force Unmount" the mounted ISO file within (which is indeed the VBoxGuestAdditions).
Also, when I click on the CD icon on the bottom right of the Ubuntu window so that I can "remove disk from virtual disk", I get a similar error message, except this time it says that it cannot unmount:
Unable to unmount the CD/DVD image C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso from the machine Ubuntu Desktop 12.04 64-bit. Would you like to force unmounting of this medium? Could not unmount the currently mounted media/drive (VERR_PDM_MEDIA_LOCKED).
But when I go to the VB GUI and select "Settings" and go to Storage, I guess I can unmount from there because I get no error message. If I unmount there and then go back into Ubuntu, the virtual CD is unmounted. Any help would be awesome!