- remove grub
apt purge --allow-remove-essential grub2-common grub-pc-bin grub-pc grub-gfxpayload-lists grub-efi-amd64-bin grub-efi-amd64-signed grub-common os-prober shim-signed libfreetype6
apt-get autoremove --purge
rm -rf /boot/grub/
rm -rf /boot/efi/EFI/ubuntu
- make sure it's not installed back
apt-mark hold "grub*"
- install systemd-boot