Thank you for your report. $ host kr.archive.ubuntu.com kr.archive.ubuntu.com is an alias for ftp.kaist.ac.kr. ftp.kaist.ac.kr has address 103.22.220.133
This mirror server is currently unavailable. This is likely a temporary issue. I have notified the relevant team at Canonical, who are tracking this incident as RT 34569. https://launchpad.net/ubuntu/+archivemirrors#yui_3_10_3_1_1572758258208_60 lists alternative mirror servers you can use at this time. As such, at this time, the issue you reported appears to be (both a service non-availability issue which has been filed with the Ubuntu mirrors team and) a support topic rather than a software bug. I am therefore changing the state of this report to incomplete - please provide further information if you still consider this to be a software bug. Thank you. ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1851094 Title: W: Failed to fetch http://kr.archive.ubuntu.com/ubuntu/dists/xenial- backports/InRelease Unable to connect to kr.archive.ubuntu.com:http: To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1851094/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs