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In previous versions of Ubuntu I followed this link and manually did the trick. In fact, I did this:

cd /media/VBOXADDITIONS_4.2.4_81684/
sudo sh VBoxLinuxAdditions.run

But in a newer version of Ubuntu, I see that /media folder is empty. I next followed this link and installed guest additions, but still I can't locate them and /media folder remains empty. Simply doing Devices -> Insert Guest Additions CD image... does not work, but results in a warning, saying that something is inaccessible. So, something wich should be just the most trivial thing in the world turns out to be a kind of sacred knowledge that only chosen ones know.

marked as duplicate by Sylvain Pineau, Fabby, Eric Carvalho, Wilf, αғsнιη Feb 23 '15 at 10:21

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Had a similar issue and found using this command worked. This was run on the VM not the host.

sudo apt-get install virtualbox-guest-dkms

After that just restart the the virtual machine.

  • Please make sure to keep important details concerning executing commands before the command itself. Some people may be anxious to have their issue solved and may by accident execute commands when they shouldn't. – Xweque Feb 22 '15 at 10:27
  • Nice "solution", if only it worked. But it didn't work. I ran "sudo apt-get install virtualbox-guest-dkms", and then restarted my virtual machine, and lo and behold - the same tiny screen. – Rafael_Espericueta May 15 '16 at 17:32

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