Translations:Some basics of MBR v/s GPT and BIOS v/s UEFI/39/en
From Manjaro
ii. Changing from BIOS to UEFI (and installing GRUB in UEFI mode). Side Effects- Other OS (can be both Linux and Windows) may or may not boot, with systemd you need to comment out the swap partition in /etc/fstab on a GPT partition table (if you use a swap partition).