I know this has been asked before but the majority of the answers given seem to be a bit out of date.
I've tried the gnome disk utility, after reading somewhere in here that it might be as simple as that, I've tried running Rufus through Wine, and I've also tried Unetbootin, which actually got me so far as to boot from my pendrive, but then I got a "Missing Operating System" message flicking on my monitor from top to bottom.
Has anybody actually tested creating a Windows 7 bootable USB from within Ubuntu 16.04. And if so, how do I do it?