Last year I got a Dell G3 15 laptop with Ubuntu 20.04 and Windows 10 for work. A few months later there was a problem with the motherboard and was basically unusable. From Dell's customer support I got a replacement (it had only W10), but decided to keep the old drives for my files, software and credentials, they are a NVME M.2 and a HDD in RAID configuration. In addition to installing the old drives in the new laptop, I changed the graphics driver to the Nouveau display driver, because the old one had a Nvidia 1650 Ti, and the new one a NV167 / Mesa Intel® UHD Graphics (CML GT2).
After I made the drives change, I can't see the GRUB screen and it boots directly to Ubuntu. I tried to repair the grub according to this tutorial, but although I could see the grub when booting from the live USB, it wasn't showing an option for Window 10, and didn't see grub again after removing the live USB.
According to efibootmgr, the first boot option is the volume where Ubuntu (and the shimx64.efi) is installed, and fdisk tells me there are two Windows 10-related volumes ("Microsoft reserved" and "Microsoft basic data") in addition to the Ubuntu and the EFI volumes.
I tried some suggestions online but with no success. Can somebody help me so it can work as it's supposed to?
