I already posted in this forum before, I couldn't resolve my problem but I think I found a way to solve it.
I installed manjaro following the user guide.
And now I can't boot manjaro using grub since it simply doesn't appear, I have to plug the usb key I used for the installation and from there "choose bootloaders" and finally "grub" and there I can boot manjaro.
And after running sudo update-grub the following message appears :
Found theme: /usr/share/grub/themes/manjaro/theme.txt Found linux image: /boot/vmlinuz-5.2-x86_64 Found initrd image: /boot/intel-ucode.img /boot/initramfs-5.2-x86_64.img Found initrd fallback image: /boot/initramfs-5.2-x86_64-fallback.img grub-probe: error: cannot find a GRUB drive for /dev/sdc1. Check your device.map. grub-probe: error: cannot find a GRUB drive for /dev/sdc1. Check your device.map. Found Windows Boot Manager on /dev/sda1@/EFI/Microsoft/Boot/bootmgfw.efi Found memtest86+ image: /boot/memtest86+/memtest.bin done
It's saying to check my device.map file, and after checking, it appears that this file doesn't exist.
I went on every forum I could for a few days, but the only command I could find to generate this file is : "grub-mkdevicemap", however in return I get a command not found error.
I tried reinstalling grub but that didn't solve the problem.
I'm quite lost, any help is welcome!