![运行 apt-get 命令时出现问题](https://linux22.com/image/1061138/%E8%BF%90%E8%A1%8C%20apt-get%20%E5%91%BD%E4%BB%A4%E6%97%B6%E5%87%BA%E7%8E%B0%E9%97%AE%E9%A2%98.png)
每当我运行 apt-get update 和 upgrade 时,我都会收到各种不同的错误消息。
有很多 503 服务不可用,但我可以 ping IP 地址并获得回复。此外,gnutls_handshake() 失败:pull 函数出错。
以下是我在 apt-get update 结束时遇到的错误
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/main/binary-amd64/Packages 503 Service Unavailable [IP: 91.189.88.152 80]
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial/main/binary-amd64/Packages 503 Service Unavailable [IP: 91.189.88.161 80]
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-updates/main/binary-amd64/Packages 503 Service Unavailable [IP: 91.189.88.161 80]
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/xenial-backports/main/binary-amd64/Packages 503 Service Unavailable [IP: 91.189.88.161 80]
E: Failed to fetch http://dl.concerto-signage.org/packages/dists/jessie/main/binary-amd64/Packages 503 Service Unavailable [IP: 173.232.104.112 80]
E: Failed to fetch https://oss-binaries.phusionpassenger.com/apt/passenger/dists/saucy/main/binary-amd64/Packages gnutls_handshake() failed: Error in the pull function.
E: Failed to fetch https://oss-binaries.phusionpassenger.com/apt/passenger/dists/xenial/main/binary-amd64/Packages gnutls_handshake() failed: Error in the pull function.
E: Some index files failed to download. They have been ignored, or old ones used instead.
如您能提供任何帮助我将非常感激。