启动盘创建器无法打开文件。我点击“其他”，找到文件，点击“打开”（或双击文件），什么反应都没有。
Rufus——也就是“balena-etcher”的对应产品——无法安全安装。
sudo tee /etc/apt/sources.list.d/balena-etcher.list
sudo apt-key adv --keyserver hkps://keyserver.ubuntu.com:443 --recv-keys 379CE192D401AB61
Executing: /tmp/apt-key-gpghome.2JnR7EAw3P/gpg.1.sh --keyserver hkps://keyserver.ubuntu.com:443 --recv-keys 379CE192D401AB61
gpg: keyserver receive failed: No such file or directory
sudo apt update
Reading package lists... Done
W: GPG error: https://dl.bintray.com/etcher/debian stable Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 379CE192D401AB61
E: The repository 'https://deb.etcher.io stable Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
并且找不到 unetbootin。
这不是唯一的问题。微软已经停止将 sha256sum 放在网上，所以我不知道我的 iso 是否正常。