The days are long gone when I have to waste a DVD to install Linux on a machine.
Step by step:
1. Download Linux Mint. I use Bit Torrent client Transmisson.
2. Install the Imagewriter with apt install usb-imagewriter.
3. Start Imagewriter. Select source .iso and destination(your USB stick). Begin the transfer and installation files from the ISO file will be transfered to the USB stick. All files on the USB stick will be erased.
4. Boot the computer from USB stick and install Linux Mint.