Landscape OpenStack Installation Requirements Checklist
Solution 1:
Not a 100% complete answer since I may need more details. Please comment here if you have anything updated you need me to look at. But, I think this could be your issue.
The checklist is dynamic, it will compute again when you reload the page. You will not need to re-install landscape. I suspect you probably did try to reload the page already -- I'm just putting this here so it's clear.
The red X is letting you know that landscape or MAAS thinks the machine doesn't have enough disks. This information is parsed from the lshw tool.
Since I've hit this before, I suspect you are running into: https://bugs.launchpad.net/maas/+bug/1355309
Could you please make sure your disks are not using the virtio driver and try again? You will need to re-commission in MAAS, perhaps re-enlist (delete, re-add). This is just a setting in the VM, so changing it there at least is easy, but in MAAS the hardware information needs to be refreshed.
The good news is: if you have landscape installed and at the checklist, you should not need to go through that process again.