Create a Bootable USB on Xubuntu with unetbootin

To create a bootable Linux installation on a flash drive (using Xubuntu):

• Insert the flash drive. After it mounts, use df to find the file system name (for example, /dev/sdd1).
• Install unetbootin if you need to:

  $ sudo apt-get install unetbootin

• Run unetbootin. *** Requires sudo access. Apparently this is a known issue with unetbootin.
• I selected the "disk image" option because I'd already downloaded the ISO I wanted:



• Press OK and it will expand the ISO onto the flash drive. *** Warning: This will delete everything on the drive.
• Insert flash drive in target machine and boot away. You might have to go into the BIOS and select the USB drive as the bootable device, depending on the motherboard brand.

Update 10/6/2013:
If you want to get rid of the pesky ldlinux.sys off the flash drive that won't even let sudo delete it, do this:

$ sudo chattr -i ldlinux.sys

Then sudo rm ldlinux.sys. (Fix taken from here).

Update 19/10/2013:
If you have an Intel motherboard and boot from a USB drive and get the message "Boot error", it could be due to the BIOS settings. This forum post describes how to fix the problem, which worked on one of my old computers with an Intel motherboard.