1. Download the iso (https://linuxmint.com/download.php)
2. Optional, check the sha256 sums.
3. Plug in your usb. In my case, I had to delete the partitions, but I didn't create a new partition. Confirm the path to your usb with $df - mine was at /dev/sda
4. sudo dd bs=4M if=/home/user/linuxmint-21.1-cinnamon-64bit.iso of=/dev/sda status=progress oflag=sync
5. Voila
