remove all the cruft from /etc/network/interfaces ... thats almost
certainly your misconfiguration.
** Changed in: network-manager (Ubuntu)
Status: New = Invalid
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Network Connection fails although Network Manager shows connected
https://bugs.launchpad.net/bugs/242071
You received this
I still have this problem, its very annoying.
But now I found out, that it is still possible to connect to the wlan,
also if the ethernet does not work.
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Network Connection fails although Network Manager shows connected
https://bugs.launchpad.net/bugs/242071
You received this bug notification
