Hi, I tried to follow the tutorial from https://qiita.com/taketomatsunaga/items/ee5c0fbed7d438d41e1e but nevertheless I ended up with the ""grub-efi-amd64-signed failed installation" With a little bit more searching, I have now in the order: recovery partition / an EFI partition / the windows partition / swap partition / ext partition / Winre partition. By trying installing it again, I still hit the same failure. I know that Ubuntu is installed on the ext partition and I think to know I need to do something with the bootloader. Here my problem, when I pay so much money, I actually do not want to mess around with the boot system. I did it already with other Pcs and something ended up not working as expected: battery consumption high, device not waking up after deep sleep, etc... Does one of you smart people has an idea what I should do?