The error message in Mainlog.txt indicates a failure to update the apt
cache:
2017-07-21 12:13:16,457 DEBUG running doUpdate() (showErrors=True)
2017-07-21 12:13:57,073 ERROR IOError/SystemError in cache.update(): ''.
Retrying (currentRetry: 0)
2017-07-21 12:14:14,628 ERROR IOError/SystemError in cache.update(): ''.
Retrying (currentRetry: 1)
2017-07-21 12:14:32,679 ERROR IOError/SystemError in cache.update(): ''.
Retrying (currentRetry: 2)
2017-07-21 12:14:32,680 ERROR doUpdate() failed completely
Perhaps another package manager was running at the same time? Could you
try the update again and let us know what happens? Thanks!
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1705698
Title:
fail to upgrade because file 150 of 151 has unmet dependencies
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