W: Failed to fetch https://community-packages.deepin.com/beige/dists/beige/InRelease  Temporary failure resolving 'community-packages.deepin.com'
W: Some index files failed to download. They have been ignored, or old ones used instead.

执行 sudo apt update后出现这个提示，我该如何操作才能修复。另外，执行 sudo apt install xxxx也会失败。我感觉是同一个问题，求助如何解决