Ethernet is not detected in ubuntu14.04. It is detected only after running "sudo ethtool -s eth0 autoneg off speed 100" and after that it works without any problem. It has to be done after every boot. How to fix this? output of ethtool eth0 is:
Settings for eth0:
Supported ports:
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supported pause frame use: No
Supports auto-negotiation: Yes
Advertised link modes: Not reported
Advertised pause frame use: No
Advertised auto-negotiation: No
Speed: 100Mb/s
Duplex: Half
Port:
PHYAD: 0
Transceiver: ]
Auto-negotiation: off
Cannot get wake-on-lan settings: Operation not permitted
Current message level:
Link detected: yes
output of sudo lshw -C network is:
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info:
logical name: eth0
version: 10
serial:
size: 100Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities:
configuration: autonegotiation=off broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8168g-3_0.0.1 04/23/13 latency=0 link=yes multicast=yes port= speed=100Mbit/s
r8168-dkms
package.