当我尝试运行 apt update 时，我遇到了这样的问题：
Ign archive.ubuntu.com wily InRelease
Ign archive.ubuntu.com wily-updates InRelease
Ign archive.ubuntu.com wily-backports InRelease
Ign archive.ubuntu.com wily-security InRelease
Err archive.ubuntu.com wily Release.gpg
Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8c01::18). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::18 80]
Err archive.ubuntu.com wily-updates Release.gpg
Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8c01::18). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::18 80]
Err archive.ubuntu.com wily-backports Release.gpg
Cannot initiate the connection to archive.ubuntu.com:80 (2001:67c:1360:8c01::18). - connect (101: Network is unreachable) [IP: 2001:67c:1360:8c01::18 80] …