Errors installing Ubuntu guest additions on VirtualBox

If you mount the guest additions and see a warning about missing kernel headers, and the additions don’t seem to work, and then after trying to launch the guest additions CD again you get VERR_PDM_MEDIA_LOCKED error and everything starts going downhill from there – this is the solution that worked for me:

1. Reinstall Ubuntu

2. Before installing the guest additions:

sudo apt-get update
sudo apt-get install build-essential linux-headers-`uname -r` dkms

3. Now launch the guest additions CD

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