sudo dd if=/dev/sda of=mbr.bak bs=512 count=1
This is where the specific phrasing becomes highly relevant. Advanced users often hunt for the standalone .deb installer file (the Debian software package format) to install the tool manually. This is common when the tool has been removed from official repositories but is still required for legacy system maintenance. Diskprobe Deb
sudo apt update sudo apt install hexedit bless ddrescue ghex sudo dd if=/dev/sda of=mbr
sudo dd if=/dev/sda bs=512 count=1 | md5sum Diskprobe Deb