Got the same problem after installing ubuntu. At first I couldn't manage to boot ubuntu from qubes startup menu, then I run boot-repair from live usb so now I can boot Ubuntu and qubes, but qubes not working properly (Quebes Dom0 startup setup failed)
followed these instructions: https://micahflee.com/2014/04/dual-booting-qubes-and-ubuntu-with-encrypted-disks/ https://www.qubes-os.org/doc/multiboot/ but couldn't boot ubuntu -- You received this message because you are subscribed to the Google Groups "qubes-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to qubes-users+unsubscr...@googlegroups.com. To post to this group, send email to qubes-users@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/qubes-users/1829c78b-a88b-483c-bc79-bc1634e22b66%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.