Comment 2 for bug 1658524

Can confirm that this happens with a fresh Ubuntu installation, byobu version 5.127, tmux 2.7.

The issue appears to be with predictable device naming. disk_io attempts to get the block device by running rtrim "$t" "0-9", where $t is the partition, and then using that to obtain a file in /sys/block/. For me, $t is nvme0n1p2, which results in nvme0n1p after rtrim, but the relevant file is /sys/block/nvme0n1.