I have Ubuntu running on Virtualbox and I used GuestAddition.iso so that when I run the VM it opens in a full screen mode.
sudo apt-get update and
sudo apt-get dist-upgrade to upgrade the old packages that were installed.
There has been no upgrade of the OS. It is still 12.04.
I successfully updated the packages but when I restarted my VM, I noticed that I again had gone back to its previous screen size and the guest additions ISO as also automatically unmounted. I remounted it but still Ubuntu would not resize itself.
What should I do?