There is no need to mount the guest additions ISO and install from it if your guest OS is Ubuntu.
Instead, open a terminal and enter the following
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sudo apt-get install virtualbox-guest-utilsNow when you have the guest additions installed, use the VirtualBox menu:
Devices > Shared Folders...
Add the path, name and enable "Auto-mount" and "Make permanent" options.
Finally add your user to the group with:
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sudo usermod -G vboxsf -a myusernameSee here: https://askubuntu.com/questions/481559/ ... virtualbox