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# write the ISO image to the boot media USB stickThe block device will show up in fdisk -l and if it does not, then you will not be able to write the ISO to the flash drive. To find the correct drive fdisk -1I found mine, it looked like this: Disk /dev/sdc: 15.1 GiB, 16231956480 bytes, 31703040 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: 0xc3072e18Yours probably wont be sdc. It could be though. I found mine because I knew the size of it, and the disk label from what I previously used it for. For the example instructions we shall continue with sdc, substitute your mount and be careful so you don't wipe out an important drive on your own system (make sure you have the correct one, do not assume sdc.)If the flash drive auto mounts (mine did,) then simply unmount it by a command umount /dev/sdcWith the block device recognized, and the partition(s) not mounted, I found this command to work best: sudo dd if=./linuxmint-19.2-cinnamon-64bit.iso of=/dev/sdc bs=4M status=progress oflag=synccan detach a USB drive with the following commands sudo eject /dev/sdc