W: Failed to fetch http://kr.archive.ubuntu.com/ubuntu/dists/xenial-backports/InRelease Unable to connect to kr.archive.ubuntu.com:http:

[parkdal]

when using sudo apt-get update
there are bug like that.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.26 [origin: unknown]
ProcVersionSignature: Ubuntu 4.15.0-45.48~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-45-generic i686
ApportVersion: 2.20.1-0ubuntu2.20
Architecture: i386
CrashDB: ubuntu
Date: Sun Nov 3 13:16:40 2019
InstallationDate: Installed on 2019-11-03 (0 days ago)
InstallationMedia: Ubuntu 16.04.6 LTS "Xenial Xerus" - Release i386 (20190227.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2019-11-03 (0 days ago)
VarLogDistupgradeAptlog:
 Log time: 2019-11-03 13:13:01.755524
 Log time: 2019-11-03 13:13:22.507612
 Log time: 2019-11-03 13:16:39.885791
 Log time: 2019-11-03 13:16:40.511523

[Tom Reynolds (tomreyn)]

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.

[Launchpad Janitor (janitor)]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no activity for 60 days.]