I wanted to install Ubuntu with dual-boot but the installer couldn't find the windows partition.
I read online that erasing the GPT could help. I did so with gdisk (wich told me that I have MBR protective and GPT present). After that I cannot load windows and Ubuntu still tell me that windows is not installed.
When I try to boot, I get a message from the motherboard that says "Default boot device missing or boot failed".
gdisk now say that I have MBR protective and no GPT.
I tried all the boot list, nothing works.
I'm scared I cannot recover my data... :/
testdisk
may help - help.ubuntu.com/community/DataRecovery