Download the target file and the associated checksum. Open a terminal. Change to the directory the iso was downloaded to verify the SHA256 checksum: For Example: echo "b9beac143e36226aa8a0b03fc1cbb5921cff80123866e718aaeba4edb81cfa63 *ubuntu-18.04.3-live-server-amd64.iso" | shasum -a 256 --check You should get the following output: ubuntu-18.04.3-live-server-amd64.iso: OK [Top][Home]