I have a Dell XPS 15 9560 and I have been using Windows 10 and Ubuntu as a dual-boot system for quite a while. When I heard about the Qubes OS I decided to give it a try. I made some free space on my disk and tried to install it alongside the other two systems. The thing is, I had to switch from UEFI to legacy mode in order to install Qubes OS. I remember when I was creating partitions for Qubes OS, I didn't make it use the existing /boot partition, I made a new /boot. After the installation, the original Ubuntu grub disappeared and there is only Qubes OS grub. I tried to add Windows menu entry to the new grub but that didn't worssk, sos I used a Windows repair drive and did
bootrec /fixmbr and
bootrec /fixboot. After that, even thess new grub disappeared and now it is just "MISSING OPERATING SYSTEM."
I used boot-repair and generated a boot-info
I know this is a complex problem but I am really hoping someone can help me with this. Thank you all in advance!