I updated the system using apt-get dist-upgrade and then I ran sudo update-manager -d to upgrade to wily werewolf but suddenly lights went off and my computer too.Now if apt-get update it is showing updates related to 15.10 and I am trying to use upgrade manager but it do not respond.How to revert my system back to where I upgraded using dist-upgrade and again be able to upgrade to 15.10.
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