networking hosed after upgrading to 10.04

[scar]

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Lucio M Nicolosi @ 05/30/2011 11:24 PM:
> Based on the network configuration of the live CD (see NetworkManager
> Applet / Connection Information or Edit Connections or ifconfig on
> Terminal) you probably can enable the correct entry on NetworkManager
> on the real install and disable every other, no need to delete the
> unused entries. I checked my own /etc/network/interfaces but it is
> virtually null, NM takes care of everything (on 10.10).

i checked this on the live cd and wasn't really able to find a solution
with the info.  on the live cd there's just one connection "Auto
ethernet" and if i pick that one on my HD install i still can't access
the internet.  i can delete some of the other connections (not the
'ifupdown (eth0)' and 'ifupdown (br0)'), but it doesn't make any difference.

i also noticed on the live CD the file
/etc/NetworkManager/nm-system-settings.conf has 'managed=false' but on
mine it is 'managed=true'.  if i set it false then the Network Manager
icon gets a red X on it and the system is disconnected from the network.

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