下载校验与命令行
SHA256
510ce77afcb9537f198bc7daa0e5b503b6e67aaed68146943c231baeaab94df1
curl -O https://releases.ubuntu.com/20.04/ubuntu-20.04.6-live-server-amd64.iso
# 校验文件完整性
md5sum ubuntu-20.04.6-live-server-amd64.iso # 期望