Qubes 4.0rc-1 installation freezes at "installing storagedx86_64 (635/998)"

[yessi...@gmail.com]

This little piece of information is not directly related to my current issue but might be relevant : I have previously tried to install Qubes 3.2 on my asus GL552VW, with little success due to graphics not being compatible (it gave me "X startup failed, falling back to text mode" and the text based installer is broken so I couldn't go from there. Trying to install using a kickstart file froze my computer at some point, too).

Now, I gave up on installing Qubes 3.2, having realised that my laptop was simply not compatible. But recently, I saw 4.0 had been pre-released, and I decided to try my hand at it. Booting on my USB, I can't see the illustration on the grub menu but I can still navigate and select options. I tried to install Qubes, and thankfully, the graphic installer worked this time! I was able to set everything up and start the installation on a partition of my hard drive. However, during installation, the progress bar froze at step 635/998 "installing storagedx86_64". I can tell it was really frozen because the progress bar, moving steadily, suddenly stops at that one step and stays there for hours (once even overnight) ; the little wheel to the right, also spinning uninterruptedly, stays completely still when it reaches that step ; and while I can still move my mouse cursor, I am no longer able to interact with the UI options "setup root password" or "setup a user" once I get to step 635/998. I imagine the same thing probably happened when I attempted to install Qubes 3.2 with a kickstart file, except I couldn't see what was going on.

After that, I have no choice but to force-shut down my PC and reboot. If I try to install Qubes again, I am greeted by "X startup failed, falling back to text mode". I have to completely wipe and re-partition my USB drive, then re-flash the Qubes ISO ; and also completely wipe the partition I was trying to install Qubes on, in order to get the graphic installer to work again. I've tried this many times, tweaking BIOS settings (such as turning fast boot on/off and turning CSM on/off, even though apparently this shouldn't be a problem on this new version of Qubes), using different USB drives, re-downloading and verifying the Qubes 4.0rc-1 ISO... no luck.

So of course, any help would be appreciated. It looks like there's no compatibility problems anymore, or at least, there shouldn't be any (I've checked the system requirements and meet all of them, plus with Fedora 25 the dreaded graphics incompatibility is gone). So maybe it's some wrong configuration in my BIOS, or Rufus isn't doing it's job correctly, or there's a problem with my hard drive? Maybe it's just a bug and should be fixed once Qubes 4.0 officially comes out? Has anyone got this problem before? Thanks in advance to anyone who is willing to help me out!