Ubuntu – How to create DOS Boot USB flash drive with (X)Ubuntu

bootfujitsu-siemenslive-usbxubuntu

I'm trying to boot Xubuntu from USB Flash Drive on my old laptop Fujitsu-Siemens but it shows "Missing Operating system. Operating System not found". Although the Flash Drive works on my current laptop.
Can I make DOS USB Flash Drive with (x)Ubuntu Live CD on it?
I tried various windows programs to make a bootable USB, and Xubuntu Startup-disk without success.

Best Answer

Install UNetbootin in the Live CD and select FreeDOS as the distribution, which will download a 1.44 MB boot image and create a DOS boot disk for you. UNetbootin is also available for Windows

Unetbootin showing FreeDOS as selected option

If you're curious the image is named ubninit and can be mounted in linux:

livewire@ZS00:/media/VOYAGER$ mkdir test
livewire@ZS00:/media/VOYAGER$ sudo mount -o loop ubninit test
[sudo] password for livewire: 
livewire@ZS00:/media/VOYAGER$ ll test/
insgesamt 125
drwxr-xr-x  4 root     root      7168 Jan  1  1970 ./
drwx------ 17 livewire livewire  4096 Aug 26 15:19 ../
-rwxr-xr-x  1 root     root     66945 Sep  3  2006 command.com*
drwxr-xr-x  2 root     root      1024 Sep  3  2006 driver/
-rwxr-xr-x  1 root     root      1768 Sep  3  2006 fdconfig.sys*
drwxr-xr-x  2 root     root      1024 Sep  3  2006 freedos/
-rwxr-xr-x  1 root     root     45341 Sep  3  2006 kernel.sys*
livewire@ZS00:/media/VOYAGER$ file ubninit 
ubninit: DOS floppy 1440k, x86 hard disk boot sector
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