не знаю как там в Убунте но в том же Арче по дефолту
$ cat /sys/block/nvme0n1/queue/scheduler
[none] mq-deadline kyber bfq

да и в самой арчвики по этому поводу:

The process to change I/O scheduler, depending on whether the disk is rotating or not can be automated and persist across reboots. For example the udev rule below sets the scheduler to none for NVMe, mq-deadline for SSD/eMMC, and bfq for rotational drives:

/etc/udev/rules.d/60-ioschedulers.rules

# set scheduler for NVMe
ACTION=="add|change", KERNEL=="nvme[0-9]n[0-9]", ATTR{queue/scheduler}="none"
# set scheduler for SSD and eMMC
ACTION=="add|change", KERNEL=="sd[a-z]|mmcblk[0-9]*", ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="mq-deadline"
# set scheduler for rotating disks
ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="bfq"

то есть bfq ненавязчиво рекомендуют использовать разве что на HDD