the problem is that if you configure your network in
/etc/network/interfaces you opt-out using network-manager.
Concrete, this means you manage your networking using the ifupdown
utilities.
If you want to use NetworkManager, remove all configuration from
/etc/network/interfaces.
If you still cannot connect after rebooting reopen this bug.
** Changed in: network-manager (Ubuntu)
Status: Incomplete => Invalid
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Network utilities don't work
https://bugs.launchpad.net/bugs/370275
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