I have a 4GB Dell Mini 9. I used UnetBootin following the instructions at pendrivelinux.com.
I have tried Xubuntu minimal install, Lubuntu minimal install, and vanilla Lubuntu, and all result in the same issue:
The second screen of the install 'Preparing to install Ubuntu' says 'for best results, please ensure that this computer has at least 10.7 GB available drive space'.
Am I doing something wrong? The system requirements for these OSes are much lower than 10.7GB.