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I have Acer Aspire E15 (E5-576G-55Y4) with installed Ubuntu 14.04.5 LTS x86. Due to compatibility issues with the tip that I need, I can't upgrade to the version above.

I just updated backports due wifi problems. Previously it was 4.4.0-131-generic. New installed version is 4.14.0-041400rc2-generic

Now uname -r says:

4.14.0-041400rc2-generic

Wifi is working, but ethernet seems like doesn't work at all

ifconfig:

eth0      Link encap:Ethernet  HWaddr d8:c4:97:0f:5b:81  
          inet addr:192.168.1.24  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::dac4:97ff:fe0f:5b81/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:201 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:14503 (14.5 KB)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:1062 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1062 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:89995 (89.9 KB)  TX bytes:89995 (89.9 KB)

wlan0     Link encap:Ethernet  HWaddr 60:f6:77:7a:46:85  
          inet addr:192.168.1.116  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::62f6:77ff:fe7a:4685/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1372 errors:0 dropped:0 overruns:0 frame:0
          TX packets:258 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:137481 (137.4 KB)  TX bytes:33560 (33.5 KB)

lshw -C network:

  *-network
       description: Wireless interface
       product: Intel Corporation
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlan0
       version: 10
       serial: 60:f6:77:7a:46:85
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=4.14.0-041400rc2-generic firmware=22.391740.0 ip=192.168.1.116 latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:129 memory:b4100000-b4101fff
  *-network
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0.1
       bus info: pci@0000:04:00.1
       logical name: eth0
       version: 12
       serial: d8:c4:97:0f:5b:81
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8411-2_0.0.1 07/08/13 ip=192.168.1.24 latency=0 link=yes multicast=yes port=MII speed=1Gbit/s
       resources: irq:127 ioport:3000(size=256) memory:b4004000-b4004fff memory:b4000000-b4003fff

lspci:

00:00.0 Host bridge: Intel Corporation Device 5914 (rev 08)
00:02.0 VGA compatible controller: Intel Corporation Device 5917 (rev 07)
00:14.0 USB controller: Intel Corporation Device 9d2f (rev 21)
00:14.2 Signal processing controller: Intel Corporation Device 9d31 (rev 21)
00:15.0 Signal processing controller: Intel Corporation Device 9d60 (rev 21)
00:16.0 Communication controller: Intel Corporation Device 9d3a (rev 21)
00:17.0 SATA controller: Intel Corporation Device 9d03 (rev 21)
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1)
00:1d.0 PCI bridge: Intel Corporation Device 9d18 (rev f1)
00:1d.2 PCI bridge: Intel Corporation Device 9d1a (rev f1)
00:1d.3 PCI bridge: Intel Corporation Device 9d1b (rev f1)
00:1f.0 ISA bridge: Intel Corporation Device 9d4e (rev 21)
00:1f.2 Memory controller: Intel Corporation Device 9d21 (rev 21)
00:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21)
00:1f.4 SMBus: Intel Corporation Device 9d23 (rev 21)
01:00.0 3D controller: NVIDIA Corporation Device 1d10 (rev a1)
03:00.0 Network controller: Intel Corporation Device 24fb (rev 10)
04:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. Device 5287 (rev 01)
04:00.1 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 12)
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  • Ubuntu 14.04 LTS is EOL & thus off-topic here, Ubuntu 14.04 ESM is supported only by Canonical through Ubuntu Advantage and still off-topic here. Only questions specific to moving to a supported release of Ubuntu are on-topic on this site for EOL or ESM release, askubuntu.com/help/on-topic – guiverc Feb 13 at 8:22
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Your ethernet seems to be working.

At least it does get IP address. Unless you have manually configured IP your ethernet does get response from DHCP and has IP assigned. That means network is working.

Now the possible problem part...

Looking at your ifconfig output we can see that both wifi (wlan0) and ethernet (eth0) share the same subnet 192.168.1.0/24. And both are connected at the same time!

Why that can be a problem?

Both cards have the same subnet and if they get their IP from the same DHCP server, then the same default route also. Which one is preferred can be seen by using route command. The one with lower metric will be used. If both have the same metric then kernel will decide on other parameters. But still only chooses one and does not use the other.

What does that mean?

Whenever you connect somewhere, kernel much choose which connection to use. If two connections share the same subnet and same routes then it only uses one of them.

If you want to test if your ethernet is really working or not, you have to disable/disconnect your wifi connection first.

You can not do any meaningful test while you have more than one active connection to the same subnet. Same goes for testing wifi connection. To be sure, disable/disconnect ethernet first.

That is the best advice I can give based on very limited information you gave.

If you add more information, I might be able to give better answer.

  • If i turn off wifi in network manager ethernet still doesn't work. route says that Iface eth0 is present. dmesg says that eth0: link up – a.wise Feb 13 at 9:36
  • How do you assign IP addresses? Manually or DHCP? – srx Feb 13 at 10:15
  • I tried both variants. DHCP and Manual – a.wise Feb 13 at 11:10
  • Do you get IP address when using DHCP? If you do, then your network is ok. But you could have other problems, like DNS resolving issue. Or maybe some sort of firewall? Do you have any iptables rules? – srx Feb 13 at 11:14
  • You should also check contents of /etc/resolv.conf – srx Feb 13 at 11:18

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