更新时，出现以下错误消息：
W: The repository 'http://ppa.launchpad.net/mc3man/trusty-media/ubuntu xenial Release' does not have a Release file.
Here, I find another statement on this error: How can I fix a 404 Error when using a PPA or updating my package lists?
建议删除某些PPA。而且，我不确定是否应该这样做，因为这可能意味着无法获取所需的更新。
这是我应该做的吗？
最佳答案
The PPA you've added does not support your version of Ubuntu. For example, the ppa:mc3man/trusty-media PPA is only for Trusty (Ubuntu 14.04) only (trusty-media). Obviously, it has no files for Xenial (16.04). You can check the PPA's Launchpad page to see which versions of Ubuntu are supported.
我建议以下内容：
Remove the PPA for older releases. For this example:
sudo ppa-purge ppa:mc3man/trusty-media- You can also try tricking apt to use the older release (How can I add a PPA from a previous release?), but that may not always work and can break things in unpredictable ways.
If there's a PPA for your version, add it. In this case, there's a PPA for Xenial: mc3man/xerus-media. You can add it using
sudo add-apt-repository ppa:mc3man/xerus-media
