I was trying to use one of the virtual box VMs provided by oracle for OBIEE. one of the major obstacle was to download the ~30GB files without any interruptions.
After the file was downloaded and extracted to one .ova using 7-zip, I observed that windows 8.1 wasn’t showing higher resolution for the linux guest OS. To get the fully functioning display driver we need to install the “Guest Additions”. Then we can use Full screen and Seamless modes.
So I had 2 interdependent issues which we try to resolve :
- Cannot change the host screen resolution
- Cannot install guest Additions
Below 2 statements were run to modify the config settings of the host from run command in guest:
“c:\Program Files\Oracle\VirtualBox\VBoxManage.exe” vboxmanage setextradata “SampleAppv506p” CustomVideoMode1 1920x1200x32
“c:\Program Files\Oracle\VirtualBox\VBoxManage.exe” vboxmanage modifyvm “SampleAppv506p” –vram 128MB
Install Guest Additions
Then I checked and increased the VRAM for guest and then tried to install the guess addition CD image. It gave this error :
Then say “Force Unmount”
Now this requires sudo password to be provided. I wasnt sure of the password as it was pre-built oracle virtual box VM. But luckily enough since I had root access (i.e the default user account was already administrator type) I was able reset the password.
Finally gave the password to proceed with the installation.
If it still doesnt work, manually eject the disk in the CDROM, by clicking on the Eject button, after selecting the CDROM device. Then try to remount Guest Additions as suggested
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