There were a few times when I previously only archived the partition of a disk because I immediately knew how to do loop mounts from just a partition image. But, with the added boot sector info, I was at lost as to how to mount that. Alas, it is fairly easy to loop mount one partition of a disk image, here’s how. (For sure this works with MBR partitioning, additional methods might be needed for GPT partitioning.)
fdisk -lu sda.img
sudo losetup -ro `echo $SIZE \* 512 | bc` /dev/loop0 sda.img
sudo mount -o ro /dev/loop0 /mnt/view/
20190417/loop mount partition from full disk image
20190417/https://askubuntu.com/questions/69363/mount-single-partition-from-image-of-entire-disk-device
20190417/https://askubuntu.com/questions/22743/how-do-i-install-guest-additions-in-a-virtualbox-vm