I've noticed that do-release-update made an half disaster: system now
thinks that update is completed (it thinks it moved to 16.10) and
software sources are modified to the new version. Apt upgrade tried to
update all packages missing but it leaved system in a totally unusable
and instable state. So I suggest to absolutely don't try to update
packets after a failed try with do-release-upgrade...
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PermissionError on upgrading from 16.04 to 16.10
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