HOWTO install boot-loader for Q4.0 RC3 separately on USB?

[edal...@riseup.net]

I've tried to install Q4.0 RC3 two times on my system with the
bootloader on a separate USB. However, two times after shutdown, the
system refuses to start (I get past the FDE-prompt, then it hangs). I've
reinstalled two times now, but its not encouraging.

Am I doing anything wrong in my setup? During install, the "only" thing
I do "ekstra" apart from following defaults, is to select the ekstra
USB-device as bootloader. I haven't done anything fancy with manual
partitioning so far, just point-and-click during install. It seems like
this setup installs part of the actual system into the USB and then
continues onto the SSD / main drive of the machine when it runs out of
space.

Is this an bug connected to 4.0 or is it a general problem?

Any suggestions? Anybody got it running effortless who has anything to
share?

-Edward

[awokd]

Does Qubes boot properly if you install it all to your hard drive? Am
wondering if the hang is related to the separate boot-loader. I think 4.0
mostly uses the Fedora 25 installer, so you might also want to see if
there are related bugs.