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I tried to follow the instructions here: Why does a Ubuntu guest in VirtualBox run very, very slowly?

However, I cannot get sudo ./VBoxLinuxAdditions.run to work as it says ./VBoxLinuxAdditions.run not found, even though I already tried sudo apt-get install virtualbox-guest-utils and restarted. And when I type /usr/lib/nux/unity_support_test -p, it still says Utiliy 3D is not supported and a bunch of lines with OpenGL warning: [..] not found in mesa table. What is going on?

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ske
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  • So be able to install the guest addition we need to mount the CD/ISO first, then `cd` to the (mounted) disk image to then run the installer script as root. Also see http://askubuntu.com/questions/22743/how-do-i-install-guest-additions-in-a-virtualbox-vm – Takkat Oct 15 '15 at 07:04
  • I followed the instructions there, and I think Guest Additions was installed successfully so I rebooted,however I'm having problems at `Note 2`. Even though I `cd /usr/share/virtualbox/` and when I `ls` I see the `VBoxGuestAdditions.iso`, when I `sudo ./VBoxLinuxAdditions.run`, it keeps saying `./VBoxLinuxAdditions.run command not found` – ske Oct 15 '15 at 07:53
  • You have to **mount** that ISO in the virtual machine. Only then you will be able to run the guest additions installer script from the guest Ubuntu. – Takkat Oct 15 '15 at 08:04
  • ok, I was able to run `sudo ./VBoxLinuxAdditions.run` and after rebooting, VirtualBox is now much faster than before, although it is still too slow and barely tolerable. I then typed `/usr/lib/nux/unity_support_test -p`, but I still see `Unity 3d supported: no`. why is this?! I see under `settings` ->`display` that `3d acceleration` is still clicked – ske Oct 15 '15 at 09:41

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