I am trying to install Tails 5.8 o/s onto a flash-driver stick, however I do not understand what the difference is between a .img or .iso images. Every other Linux distribution I have installed uses a .iso image. Will a .img image work the same as a .iso image?
I also noticed that my Linux Mint’s Accessory, USB Image Writer will not work on the .img image, for checking integrity with a SHA256SUMS.
“I am trying to install Tails 5.8”
5.9 is out now, FWIW.
Here’s some info about .img & .iso file formats from Wikipedia:
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IMG, in computing, refers to binary files with the .img filename extension that store raw disk images of floppy disks, hard drives, and optical discs or a bitmap image – .img.
The .img filename extension is used by disk image files, which contain raw dumps of a magnetic disk or of an optical disc. Since a raw image consists of a sector-by-sector binary copy of the source medium, the actual format of the file contents will depend on the file syste...
An optical disc image (or ISO image, from the ISO 9660 file system used with CD-ROM media) is a disk image that contains everything that would be written to an optical disc, disk sector by disc sector, including the optical disc file system. ISO images are expected to contain the binary image of an optical media file system (usually ISO 9660 and its extensions or UDF), including the data in its files in binary format, copied exactly as they were stored on the disc. The data inside the ISO ima IS...
.img is generally for USB installs, .iso is usually for CD/DVD burning (installs).
 As far as Tails is concerned