Comment 35 for bug 1275161

another one here.
made ubuntu forum post here asking others to test LAN speed:
http://ubuntuforums.org/showthread.php?t=2245203

killing lightgm resolves the problem and speed jumps to 12mb/s . But once back in GUI, problem returns.

Tested using Netcat and iperf, LAN speeds peek out at 1.2MB/s

Effected:
PC1
Desotop, Ram Page 3 Extreme motherboard:
Description: Ubuntu 14.04.1 LTS
Linux ubuntu 3.13.0-34-generic #60-Ubuntu SMP Wed Aug 13 15:45:27 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
network
       description: Ethernet interface
       product: 82567V-2 Gigabit Network Connection

LAPTOP 1
Description: Ubuntu 12.04.4 LTS
Linux user 3.11.0-26-generic #45~precise1-Ubuntu SMP Tue Jul 15 04:04:35 UTC 2014 i686 i686 i386 GNU/Linux

network
       description: Ethernet interface
       product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.

ntel(R) PRO/1000 Network Driver - 3.1.0.2-NAPI

Ethernet controller [0200]: Intel Corporation 82567V-2 Gigabit Network Connection [8086:10ce]
 Subsystem: ASUSTeK Computer Inc. Device [1043:82d5]
 Kernel driver in use: e1000e

Updating driver does not help.