This seems to be an issue with your network.
92 2016-08-14 03:03:37,179 ERROR IOError/SystemError in cache.update():
'W:Failed to fetch
http://archive.ubuntu.com/ubuntu/dists/xenial/main/source/Sources Ca nnot
initiate the connection to archive.ubuntu.com:80 (91.189.88.152). - connect
(101: Network is unreachable) [IP: 91.189.88.152 80]
93 , W:Failed to fetch
http://archive.ubuntu.com/ubuntu/dists/xenial/universe/source/Sources Cannot
initiate the connection to archive.ubuntu.com:80 (91.189.88 .152). - connect
(101: Network is unreachable) [IP: 91.189.88.152 80]
94 , W:Failed to fetch
http://archive.ubuntu.com/ubuntu/dists/xenial/multiverse/source/Sources Cannot
initiate the connection to archive.ubuntu.com:80 (91.189. 88.152). - connect
(101: Network is unreachable) [IP: 91.189.88.152 80]
This is a situation you'll need to resolve before the upgrade will be
able to proceed.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1612996
Title:
I tried to upgrade my Linux Ubunty, but the upgrade failed two times.
I got a message that the process requires download files from
untrusted sites.
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