New answers tagged live-cd
The file you get from http://www.ubuntu.com/download/desktop provides both installing and testing. Download Ubuntu 14.04. Then look over here to learn how to create a live usb stick. Also, make sure to enable booting from usb in your bios settings in case it isn't set that way anyway.
iso-scan is wired to not ask anything by default, so it will mount all known drives one by one and look for the iso in them. But if you run it with very low debconf priority it will ask whether it should look into all devices or let you select which ones (shared/ask_device=manual) and in the latter case, which ones (shared/enter_device=/dev/<SOMEDEV>) ...
Right next to the power switch there is a little button that you'll need to press & hold with a small screw driver/pin. Arrow down to Boot Menu and click Enter. Arrow down to the HDD (DVD drive) and click enter. If that doesn't work, disable secure boot and enable legacy boot.
Boot a Live System from CD/DVD/USB Assuming the root partition of the Ubuntu installation on the hdd is sda1, mount it to /mnt sudo mount /dev/sda1 /mnt If the root filesystem is not on on sda1 use e.g sudo fdisk -l to find the correct identifier. Open the file /mnt/etc/grub.d/40_custom with your favorite editor, e.g sudo nano /mnt/etc/grub.d/40_custom ...
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