Ubuntu 18.04 showing error with sudo apt update: "Cannot initiate the connection to in.archive.ubuntu.com:80 ... 101: Network is unreachable"

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I tried all of the solutions from similar question.

Err:1 http://in.archive.ubuntu.com/ubuntu bionic InRelease
  Could not connect to in.archive.ubuntu.com:80 (91.189.88.161). - connect (111: Connection refused) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::14). - connect (101: Network is unreachable) Could not connect to in.archive.ubuntu.com:80 (91.189.88.162). - connect (111: Connection refused) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::17). - connect (101: Network is unreachable) Could not connect to in.archive.ubuntu.com:80 (91.189.88.149). - connect (111: Connection refused) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::21). - connect (101: Network is unreachable) Could not connect to in.archive.ubuntu.com:80 (91.189.88.152). - connect (111: Connection refused) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::11). - connect (101: Network is unreachable)
Err:2 http://in.archive.ubuntu.com/ubuntu bionic-updates InRelease
  Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::14). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::17). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::21). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::11). - connect (101: Network is unreachable)
Err:3 http://in.archive.ubuntu.com/ubuntu bionic-backports InRelease
  Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::14). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::17). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::21). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::11). - connect (101: Network is unreachable)
Err:4 http://in.archive.ubuntu.com/ubuntu bionic-security InRelease
  Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::14). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::17). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::21). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::11). - connect (101: Network is unreachable)
Err:5 http://dl.google.com/linux/chrome/deb stable InRelease
  Could not connect to dl.google.com:80 (172.217.167.14). - connect (111: Connection refused) Cannot initiate the connection to dl.google.com:80 (2404:6800:4002:80a::200e). - connect (101: Network is unreachable)
Reading package lists... Done
Building dependency tree       
Reading state information... Done
All packages are up to date.
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic/InRelease  Could not connect to in.archive.ubuntu.com:80 (91.189.88.161). - connect (111: Connection refused) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::14). - connect (101: Network is unreachable) Could not connect to in.archive.ubuntu.com:80 (91.189.88.162). - connect (111: Connection refused) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::17). - connect (101: Network is unreachable) Could not connect to in.archive.ubuntu.com:80 (91.189.88.149). - connect (111: Connection refused) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::21). - connect (101: Network is unreachable) Could not connect to in.archive.ubuntu.com:80 (91.189.88.152). - connect (111: Connection refused) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::11). - connect (101: Network is unreachable)
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease  Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::14). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::17). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::21). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::11). - connect (101: Network is unreachable)
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic-backports/InRelease  Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::14). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::17). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::21). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::11). - connect (101: Network is unreachable)
W: Failed to fetch http://in.archive.ubuntu.com/ubuntu/dists/bionic-security/InRelease  Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::14). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::17). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1360:8001::21). - connect (101: Network is unreachable) Cannot initiate the connection to in.archive.ubuntu.com:80 (2001:67c:1560:8001::11). - connect (101: Network is unreachable)
W: Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/InRelease  Could not connect to dl.google.com:80 (172.217.167.14). - connect (111: Connection refused) Cannot initiate the connection to dl.google.com:80 (2404:6800:4002:80a::200e). - connect (101: Network is unreachable)
W: Some index files failed to download. They have been ignored, or old ones used instead.

101: Network is unreachable So do you have internet connection? Are you using a VPN or proxy? Are you behind a corporate/university firewall? — wjandrea, Jul 22 '18 at 19:48
Possible duplicate of Error 101: Network is unreachable when trying to update and Why I do get error 101? How is my DNS involved? — karel, Jul 23 '18 at 01:10
@Thomas: It appears that the same issue occurs for IPv4 connections. — David Foerster, Jul 23 '18 at 16:34
Welcome to Ask Ubuntu! Could you please add a little more detail? What exactly did you do, what did you expect to happen and what happened instead? Did you encounter any warning or error messages? Please reproduce them in their entirety in your question. You can select, copy and paste terminal content and most dialogue messages in Ubuntu. What's the output of ip a and for n in {in.,}archive.ubuntu.com; do for v in '' 6; do ping$v -c4 $n; done; done? Please [edit] your post to add information instead of posting a comment. (see How do I ask a good question?) — David Foerster, Jul 23 '18 at 16:38

Ubuntu 18.04 showing error with sudo apt update: "Cannot initiate the connection to in.archive.ubuntu.com:80 ... 101: Network is unreachable"

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