Mount disk image partition

View partition table of disk.img:

fdisk -lu disk.img
Disk disk.img: 1.3 GiB, 1361051648 bytes, 2658304 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x6f92008e

Device    Boot  Start     End Sectors  Size Id Type
disk.img1        8192  131071  122880   60M  c W95 FAT32 (LBA)
disk.img2      131072 2658303 2527232  1.2G 83 Linux

Mount partition by using start multiplied by sector size as offset

mount -o loop,offset=$((131072 * 512)) disk.img /mnt