Ethernet link is down

My Ubuntu 20.04 laptop can connect through wireless but not wired. ip link shows:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp0s31f6: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000 link/ether 70:5a:0f:d8:0a:f7 brd ff:ff:ff:ff:ff:ff
3: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DORMANT group default qlen 1000 link/ether 44:85:00:b5:6d:82 brd ff:ff:ff:ff:ff:ff

I tried sudo ip link set up dev enp0s31f6 but the link remained down.

lspci -nnk | grep 0200 -A3 gives:

00:1f.6 Ethernet controller [0200]: Intel Corporation Ethernet Connection I219-V [8086:1570] (rev 21) Subsystem: Hewlett-Packard Company Ethernet Connection I219-V [103c:8079] Kernel driver in use: e1000e Kernel modules: e1000e

dmesg|grep e1000e gives:

[ 4.095621] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
[ 4.095622] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
[ 4.095640] e1000e 0000:00:1f.6: enabling device (0000 -> 0002)
[ 4.096716] e1000e 0000:00:1f.6: Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode
[ 4.339134] e1000e 0000:00:1f.6 0000:00:1f.6 (uninitialized): registered PHC clock
[ 4.411453] e1000e 0000:00:1f.6 eth0: (PCI Express:2.5GT/s:Width x1) 70:5a:0f:d8:0a:f7
[ 4.411455] e1000e 0000:00:1f.6 eth0: Intel(R) PRO/1000 Network Connection
[ 4.411521] e1000e 0000:00:1f.6 eth0: MAC: 12, PHY: 12, PBA No: FFFFFF-0FF
[ 4.429803] e1000e 0000:00:1f.6 enp0s31f6: renamed from eth0
[ 2049.084704] e1000e: enp0s31f6 NIC Link is Down

What is a possible solution?

4

1 Answer

This particular network device has a history of throwing errors at boot time that Windows ignores and Linux pays attention to. That said, it can generally be fixed with the latest driver from Intel, though it does require a bit more effort.

Try this:

1. Download the latest driver from Intel (Version 3.8.4 as of this answer)
2. Extract the files and change to the src directory:
   cd e1000e-3.8.4/src/
3. Remove any existing e1000e drivers from the kernel:
   sudo rmmod e1000e
4. Compile the driver module:
   sudo make install
5. Load the module using modprobe:
   sudo modprobe e1000e

The output will be written to /lib/modules/updates/drivers/net/ethernet/intel/e1000e/e1000e.ko. At this point you can test your network by accessing a website or pinging another machine on your network. So long as everything is good, you can make the change permanent with:

sudo dpkg-reconfigure linux-image-$(uname -r)
update-initramfs -u

Hope this helps.

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