I often upgrade to a new release of Ubuntu, think I could have got some malware and then have to use my LiveUSB to install a fresh install, however the LiveUSB is using an old version, so I was wondering if it possible to boot from a LiveUSB in order to download an Ubuntu ISO and then use the Startup Disk Creator to make another LiveUSB? So I would boot from one in order to make another.

Is this possible or could there be any problems with doing this? The version of Ubuntu on my LiveUSB is Ubuntu GNOME 15.04, it's just that if I get infected with something I don't want to keep carry on installing an old version and then having to upgrade again, I would prefer just to create a LiveUSB with the latest version, however I have to be sure that my system is clean otherwise I could infect the new LiveUSB.

**Clarification:**

15.04 is currently the latest stable release, however soon 15.10 will be released and I will upgrade to it, however if once I have upgraded I get a virus or something then I will have to do a fresh install of 15.04 and then upgrade again, what I would much prefer to do is to install a fresh install of 15.10 when it comes out, but make sure that it could not have anything injected into it.