I have a netbook (Asus eee PC 1001P) running Ubuntu 13.10. I want to install Lubuntu 14.04 on it. I downloaded the Lubuntu ISO and used Unetbootin (on my newer laptop, running Ubuntu 14.04) to create a bootable USB with the iso file. But when I start the netbook with the USB stick plugged in, it just boots straight into Ubuntu 13.10. Holding down shift shows the GRUB menu, but the USB system is not listed there.
I also tried creating the USB with the same ISO file and usb-creator-gtk, with the same result (the USB seems invisible to the netbook during boot). The USB mounts fine on the netbook once Ubuntu is already loaded. Any ideas?