On Mon, Aug 22, 2016 at 10:38:34AM +0300, Виталий wrote: > The problem is that the bootable USB flash drive needs to be done in Windows. > Linux is not installed to main system. There are only a feeble laptop with > ArhLinux - Cinnamon+gdm, but a without internet.
You might be interested in Linux Live USB http://www.linuxliveusb.com/ It works with 'custom' .img files too. Suggesting cat to a user who might or might not be technically is an awful idea.