I just installed a fresh copy of Debian 8.4 in VirtualBox 5.0.20.

I am now attempting to install the "Guest Additions" CD. To do so I had to change my fstab so I am able to execute things from the CD, so this is already fixed.

But now I get the following error:

root@debian:/media/cdrom# ./autorun.sh
Error constructing proxy for org.gnome.Terminal:/org/gnome/Terminal/Factory0: The connection is closed

Can someone please help?

  1. Change the permissions in fstab back to the default. As a normal user:
  2. sudo apt-get update && sudo apt-get upgrade && sudo apt-get install build-essential module-assistant
  3. sudo m-a prepare
  4. Mount the Guest Additions CD using the VirtualBox Menu (sudo mount /media/cdrom)
  5. sudo sh /media/cdrom/VBoxLinuxAdditions.run

If the error you noted still occurs, make sure your Virtual Network Adapter is Enabled, like so: VirtualBox Settings -Network

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