请原谅我的菜鸟问题，因为我刚接触 Linux 环境。我遇到了错误sudo apt-get update
W: Failed to fetch http://deb.playonlinux.com/dists/precise/InRelease The following signatures couldn't be verified because the public key is not available: NO_PUBKEY E0F72778C4676186
E: Failed to fetch http://ppa.launchpad.net/pmcenery/ppa/ubuntu/dists/xenial/main/source/Sources 404 Not Found
W: Some index files failed to download. They have been ignored, or old ones used instead.
这个 ppa.launchpad.net/pmcenery 有一些错误，我在谷歌搜索后找到了一些建议，它告诉我通过执行以下操作来删除密钥
sudo apt-get del Keyno。我确实删除了它，但仍然有一些错误，现在它说没有公钥。
请建议如何解决这个问题。
答案1
删除对“http://deb.playonlinux.com....“ 并 ”http://ppa.launchpad.net/pmcenery/...”来自/etc/apt/sources.list