I created a bootable DVD by buring the disk image of the lubuntu iso file (lubuntu-18.04-alternate-i386.iso), and when I restart my old Dell labtop (running VISTA) the DVD starts spinning and the computer thinks for a bit, but eventually Windows boots. How can I install lubuntu? I also tried a USB and changed the BIOS to load from the USB, that didn't work either. Thanks for all your help!