在无法使用 Mozilla 浏览器浏览后，我尝试更新。我可以 ping 出，所以我在网络上。DNS 无法使用 IP 地址解析。以下是我尝试 apt-get update 的输出。
Err http://extras.ubuntu.com trusty InRelease
Err http://extras.ubuntu.com trusty Release.gpg
Unable to connect to extras.ubuntu.com:http:
Err http://security.ubuntu.com trusty-security InRelease
Err http://security.ubuntu.com trusty-security Release.gpg
Cannot initiate the connection to security.ubuntu.com:80 (2001:67c:1360:8c01::18). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::18 80]
Err http://ca.archive.ubuntu.com trusty InRelease
Err http://ca.archive.ubuntu.com trusty-updates InRelease
Err http://ca.archive.ubuntu.com trusty-backports InRelease
Err http://ca.archive.ubuntu.com trusty Release.gpg
Cannot initiate the connection to ca.archive.ubuntu.com:80 (2001:67c:1360:8c01::19). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::19 80]
Err http://ca.archive.ubuntu.com trusty-updates Release.gpg
Cannot initiate the connection to ca.archive.ubuntu.com:80 (2001:67c:1360:8c01::19). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::19 80]
Err http://ca.archive.ubuntu.com trusty-backports Release.gpg
Cannot initiate the connection to ca.archive.ubuntu.com:80 (2001:67c:1360:8c01::19). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::19 80]
Err http://dl.google.com stable InRelease
Err http://dl.google.com stable Release.gpg
Cannot initiate the connection to dl.google.com:80 (2607:f8b0:400a:804::1007). - connect (101: Network is unreachable) [IP: 2607:f8b0:400a:804::1007 80]
Reading package lists...