I am trying to install the VirtualBox guest additions in to my ubuntu vm using the following command sudo apt-get install -y dkms build-essential linux-headers-generic linux-headers-$(uname -r). I get the following error: 
I tried sudo apt-get update && sudo apt-get upgrade, udo apt-get upgrade --fix-missing and sudo apt-get clean
It seems a version 2.8.1 exists in the same folder.
Any ideas on how I could fix this?
PS: I have close to 0 Linux knowledge, a gui approach would be preferred
