It looks like there was an error with your network:
2016-08-05 19:16:00,203 ERROR IOError/SystemError in cache.update(): 'W:Failed
to fetch
http://security.ubuntu.com/ubuntu/dists/xenial-security/main/binary-i386/Packages
Unable to connect to security.ubuntu.com:http: [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch
http://security.ubuntu.com/ubuntu/dists/xenial-security/restricted/binary-i386/Packages
Unable to connect to security.ubuntu.com:http: [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch
http://security.ubuntu.com/ubuntu/dists/xenial-security/universe/binary-i386/Packages
Unable to connect to security.ubuntu.com:http: [IP: 2001:67c:1360:8001::21 80]
, W:Failed to fetch
http://security.ubuntu.com/ubuntu/dists/xenial-security/multiverse/binary-i386/Packages
Unable to connect to security.ubuntu.com:http: [IP: 2001:67c:1360:8001::21 80]
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1610328
Title:
Upgrade from 14.04 LTS to 16 has failed
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