apt更新失败，因为它无法连接到ppa.launchpad.net

Question

当我尝试使用apt更新更新时，我会得到以下错误。

Err:10 http://ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu bionic InRelease
Could not connect to ppa.launchpad.net:80 (91.189.95.83), connection timed out Could not   connect to ppa.launchpad.net:80 (2001:67c:1560:8008::15), connection timed out
Err:11 http://ppa.launchpad.net/js-reynaud/kicad-5.1/ubuntu bionic InRelease
Unable to connect to ppa.launchpad.net:http:
Err:12 http://ppa.launchpad.net/tista/plata-theme/ubuntu bionic InRelease
Unable to connect to ppa.launchpad.net:http:
Err:13 http://ppa.launchpad.net/ubuntubudgie/backports/ubuntu bionic InRelease
Unable to connect to ppa.launchpad.net:http:
Err:14 http://ppa.launchpad.net/zeal-developers/ppa/ubuntu bionic InRelease
Unable to connect to ppa.launchpad.net:http:
Fetched 7,502 B in 31s (238 B/s)
Reading package lists...
Building dependency tree...
Reading state information...
1 package can be upgraded. Run 'apt list --upgradable' to see it.
W: Failed to fetch http://ppa.launchpad.net/danielrichter2007/grub-customizer/ubuntu/dists/bionic/InRelease  Could not connect to ppa.launchpad.net:80 (91.189.95.83), connection timed out Could not connect to ppa.launchpad.net:80 (2001:67c:1560:8008::15), connection timed out
W: Failed to fetch http://ppa.launchpad.net/js-reynaud/kicad-5.1/ubuntu/dists/bionic/InRelease  Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/tista/plata-theme/ubuntu/dists/bionic/InRelease  
Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/ubuntubudgie/backports/ubuntu/dists/bionic/InRelease  Unable to connect to ppa.launchpad.net:http:
W: Failed to fetch http://ppa.launchpad.net/zeal-developers/ppa/ubuntu/dists/bionic/InRelease  Unable to connect to ppa.launchpad.net:http:
W: Some index files failed to download. They have been ignored, or old ones used instead.

事情是，我可以访问这些链接从我的网页浏览器，所以它不应该是一个问题的服务器。

而且，我只在更新IPV4以查看它的IPV6问题时才尝试强迫它。另外，我已经尝试删除所有这些ppas，并再次添加它们。

Answer 1

好的，现在解决了，当我连接到我大学宿舍的网络时。可能是ISP或路由器的问题。

更新：

好的，我发现了这个问题，我想把它添加到这里的讨论中会很好，这样其他人可能会发现它有帮助。

问题是我的家庭网络调制解调器中没有启用ipv6。所以我去了调制解调器配置ip地址并启用了它，这个问题也在我的家里得到了解决。

你的ISP也可能不支持ipv6，印度的BSNL就是这种情况，所以也要注意这一点。

Answer 2

当我体验到这一点(偶尔不会改变网络)时，我发现使用apt-get而不是apt是有效的。