I have made two live USB pen drives. Using two different computers, both running Ubuntu FF. I downloaded the iso from a torrent. I check summed the file. I formatted the USB key to FAT 32, created the live image using Unetbootin, and keep getting a long busybox error message. I make a Kubuntu live USB the same way any it's fine. I copied this text from a picture of the error message:
0.098110] x86/cpu: VMX (outside TXT) disabled by BIOS
0.880932] integrity: Couldn't parse dbx signatures: -74 [ BusyBox v1.30.1 (Ubuntu 1:1.30.1-7ubuntu3) built-in shell (ash) Enter 'help' for a list of built-in commands. (initramfs) The disk contains an unclean file system (0, 0). Metadata kept in Windows cache, refused to mount. Falling back to read-only mount because the NTFS partition is in an unsafe state. Please resume and shutdown Windows fully (no hibernation or fast restarting.) Could not mount read-write, trying read-only losetup: /cdrom/casper/filesystem. squashfs: Warning: file does not fit into a 512-byte sector; th mount: mounting /dev/loop0 on /filesystem.squashfs failed: Invalid argument Can not mount /dev/loop0 (/cdrom/casper/filesystem.squashfs) on /filesystem.squashfs
There may be a little bit of the message missing on the longer lines...