I have the same problem feisty 64 2.6.20-16-generic
Jun 16 13:49:03 PostProd dhcdbd: Started up.
Jun 16 13:49:05 PostProd NetworkManager: <information>^Istarting...
Jun 16 13:49:05 PostProd NetworkManager: <information>^Ieth0: Device is fully-supported using driver '8139too'.
Jun 16 13:49:05 PostProd NetworkManager: <information>^Inm_device_init(): waiting for device's worker thread to start
Jun 16 13:49:05 PostProd NetworkManager: <information>^Inm_device_init(): device's worker thread started, continuing.
Jun 16 13:49:05 PostProd NetworkManager: <information>^INow managing wired Ethernet (802.3) device 'eth0'.
Jun 16 13:49:05 PostProd NetworkManager: <information>^IDeactivating device eth0.
Jun 16 13:49:05 PostProd dhcdbd: message_handler: message handler not found under /com/redhat/dhcp/eth0 for sub-path eth0.dbus.get.reason
I have the same problem feisty 64 2.6.20-16-generic ^Istarting. .. ^Ieth0: Device is fully-supported using driver '8139too'. ^Inm_device_ init(): waiting for device's worker thread to start ^Inm_device_ init(): device's worker thread started, continuing. ^IDeactivating device eth0. dhcp/eth0 for sub-path eth0.dbus. get.reason
Jun 16 13:49:03 PostProd dhcdbd: Started up.
Jun 16 13:49:05 PostProd NetworkManager: <information>
Jun 16 13:49:05 PostProd NetworkManager: <information>
Jun 16 13:49:05 PostProd NetworkManager: <information>
Jun 16 13:49:05 PostProd NetworkManager: <information>
Jun 16 13:49:05 PostProd NetworkManager: <information>^INow managing wired Ethernet (802.3) device 'eth0'.
Jun 16 13:49:05 PostProd NetworkManager: <information>
Jun 16 13:49:05 PostProd dhcdbd: message_handler: message handler not found under /com/redhat/
starting applications is slower too.