Can’t connect to internet in ubuntu 15.04 using DSL cable [on hold]

I upgraded my ubuntu 14.10 to 15.04 but aftes upgrading I am not able to connect to internet. For information, I am using DSL cable to connect to internet. The error message is
Connection Activation failed
(1) Creating object for path ‘/org/freedesktop/NetworkManager/ActiveConnection/4’ failed in libnm-glib.

Source: ubuntu

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