Was there another package management application running when you were
trying to upgrade? From Mainlog.txt we can see a failure to get lock.

2016-10-14 18:00:04,012 DEBUG apt btrfs snapshots supported: False
2016-10-14 18:00:04,012 INFO cache.commit()
2016-10-14 18:00:04,012 DEBUG failed to SystemUnLock() (E:Not locked) 
2016-10-14 18:00:04,013 ERROR IOError in cache.commit(): 'Failed to lock 
/var/cache/apt/archives/lock'. Retrying (currentTry: 0)
2016-10-14 18:00:04,013 INFO cache.commit()
2016-10-14 18:00:04,013 DEBUG failed to SystemUnLock() (E:Not locked) 
2016-10-14 18:00:04,014 ERROR IOError in cache.commit(): 'Failed to lock 
/var/cache/apt/archives/lock'. Retrying (currentTry: 1)
2016-10-14 18:00:04,015 INFO cache.commit()
2016-10-14 18:00:04,015 DEBUG failed to SystemUnLock() (E:Not locked) 
2016-10-14 18:00:04,015 ERROR IOError in cache.commit(): 'Failed to lock 
/var/cache/apt/archives/lock'. Retrying (currentTry: 2)
2016-10-14 18:00:04,016 ERROR giving up on fetching after maximum retries
2016-10-14 18:00:04,016 DEBUG abort called

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1633545

Title:
  PermissionError on upgrading from 16.04 to 16.10

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