For GRUB: GRUB_TERMINAL_INPUT="console serial" GRUB_SERIAL_COMMAND="serial --unit=0 --speed=115200" * https://wiki.archlinux.org/title/working_with_the_

For GRUB: GRUB_TERMINAL_INPUT="console serial" GRUB_SERIAL_COMMAND="serial --unit=0 --speed=115200" * https://wiki.archlinux.org/title/working_with_the_serial_console https://wiki.archlinux.org/title/working_with_the_serial_con... * https://help.ubuntu.com/community/SerialConsoleHowto https://help.ubuntu.com/community/SerialConsoleHowto In addition / alternatively to systemD, you can also tell the kernel about the serial console (especially for kernel boot output): GRUB_CMDLINE_LINUX="console=tty0 console=ttyS0,115200n8" Also, perhaps because I'm a bit 'old fashioned', I don't really like that a lot of distros have "splash quiet" in the options: I like seeing the output. Also not have a fan of having a GRUB timeout of zero and not having a GRUB menu.