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On one of the machines that I have Ubuntu installed NetworkManager has to be started manually by me (sudo NetworkManager start - as far as I remember). It is a bit inconvenient to be forced to start NetworkManager every time by hand. I think it started working like that after I bought myself a wireless router and stopped using direct PPPoE connection.

On all other machines it works as expected.

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up vote 3 down vote accepted

OK. I've managed to fix the issue. I've tried to compare as many configuration files related to networking as possible.

  1. A change in NetworkManager: I had to change managed (in ifupdown section) to false. That didn't fix the issue itself, but may be connected.
  2. Having a look at I've changed my /etc/network/interfaces to be exactly as the one on my second machine (which works without any problems). My interfaces file was:

auto lo
iface lo inet loopback

allow-hotplug eth0
auto eth0
iface eth0 inet dhcp

and I've changed it to:

auto lo
iface lo inet loopback

And now it works! I hope it will help others having similar issue (especially when dealing with PPPoE in the past).

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