Ubuntu – Ethernet getting connected but no internet

ethernetinternetnetwork-managernetworking

THE COMPUTER

  1. This is an assembled computer without any in-built Bluetooth and WiFi features.
    enter image description here

  2. Recently I changed my ISP for a high-speed internet connection. After installation of the fibre optic cable and its router, I connected the ethernet cable and switched on. The Ubuntu 16.04.2 LTS seamlessly configured automatically and connected to the internet in the first go, without any MAC or password for the router. The speed was 110 to 130 Mbps bothways.

PROBLEM

  1. On July 17, 2017 there was a prompt for available updates for Ubuntu. I installed that. When I re-started the computer next day, I found that ethernet is getting connected after a long time. But surprisingly, Firefox was unable to connect to any server.

  2. This is the Network Setting of my computer.
    enter image description here

  3. I tried different usual actions but to no avail. Below is the screen-shot of Ethernet Connection Information.

    enter image description here

SEARCH AND RESEARCH

  1. I have a Netgear N150 Wireless USB Adapter. I plugged it in and restarted the computer. Ubuntu recognised and configured it. Connected to the internet. Browsing was smooth. The speed is 50 Mbps both ways.

  2. Below is a screen-shot of the working WiFi Connection Information.
    enter image description here

  3. I tried many non-destructive suggestions from the forum, like updating Ubuntu, cleaning by ‘autoremove’, disabling the IPv6, manually entering IP and other numbers on IPv4 setting, browsing through Chrome, changing the ethernet cable and so on. BUT all in vein! It remained connected but no browsing is possible.

  4. I love Ubuntu but very novice when such problem surfaces. I noticed experts do ask output results to diagnose the problem. So to help my erudite friends to do so, and suggesting its remedy, I have pasted few output of commonly asked command line instructions below.

    ashoke@ashoke-desktop:~$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface

(Please note, nothing was shown as above. But the same command on WiFi mode displayed the following.)
enter image description here
…………………………..
enter image description here

enter image description here

enter image description here

Please help me. Best wishes to all.

As suggested following is the result removing the WiFi adapter. 

ashoke@ashoke-desktop:~$ dmesg | grep -e e100 -e eno
[    0.711515] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
[    0.711997] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
[    0.712622] e1000e 0000:00:19.0: Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode
[    0.881849] e1000e 0000:00:19.0 eth0: registered PHC clock
[    0.882325] e1000e 0000:00:19.0 eth0: (PCI Express:2.5GT/s:Width x1) 00:22:4d:ab:ab:f0
[    0.882822] e1000e 0000:00:19.0 eth0: Intel(R) PRO/1000 Network Connection
[    0.883331] e1000e 0000:00:19.0 eth0: MAC: 11, PHY: 12, PBA No: FFFFFF-0FF
[    0.884452] e1000e 0000:00:19.0 eno1: renamed from eth0
[   78.836980] IPv6: ADDRCONF(NETDEV_UP): eno1: link is not ready
[   79.043535] IPv6: ADDRCONF(NETDEV_UP): eno1: link is not ready
[   82.629365] e1000e: eno1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: Rx/Tx
[   82.629400] IPv6: ADDRCONF(NETDEV_CHANGE): eno1: link becomes ready
ashoke@ashoke-desktop:~$

A. I forgot to mention before, that I booted the computer through a live-USB device of the Ubuntu 16.04.2 LTS. It did not detect the ethernet. But manually it was possible to enable WiFi setting of the router.

B. @ chili555

Below is the report of the command you suggested. It is very long. So I paste few top lines. 

ashoke@ashoke-desktop:~$ cat /var/log/syslog | grep -i dns
[    Jul 22 15:44:53 ashoke-desktop avahi-daemon[767]: Leaving mDNS multicast group on interface eno1.IPv6 with address fe80::aecf:d490:5a05:4046.
[    Jul 22 15:44:53 ashoke-desktop avahi-daemon[767]: Interface eno1.IPv6 no longer relevant for mDNS.
[    Jul 22 15:44:54 ashoke-desktop avahi-daemon[767]: Joining mDNS multicast group on interface eno1.IPv6 with address fe80::aecf:d490:5a05:4046.
[    Jul 22 15:44:54 ashoke-desktop avahi-daemon[767]: New relevant interface eno1.IPv6 for mDNS.
[    Jul 22 15:45:40 ashoke-desktop NetworkManager[857]: <info>  [1500718540.9292] policy: set 'Ethernet connection 1' (eno1) as default for IPv6 routing and DNS
[    Jul 22 16:02:34 ashoke-desktop avahi-daemon[767]: Leaving mDNS multicast group on interface eno1.IPv6 with address fe80::aecf:d490:5a05:4046.
[    Jul 22 16:02:34 ashoke-desktop avahi-daemon[767]: Interface eno1.IPv6 no longer relevant for mDNS.
[    Jul 22 16:03:23 ashoke-desktop avahi-daemon[767]: Joining mDNS multicast group on interface wlxc43dc7c58344.IPv6 with address fe80::ef46:e843:2ab1:898f.
[    Jul 22 16:03:23 ashoke-desktop avahi-daemon[767]: New relevant interface wlxc43dc7c58344.IPv6 for mDNS.
[    Jul 22 16:03:24 ashoke-desktop NetworkManager[857]: <info>  [1500719604.6555] policy: set 'JioFiber-RQwx4' (wlxc43dc7c58344) as default for IPv6 routing and DNS
******************
[    Jul 22 19:01:06 ashoke-desktop NetworkManager[870]: <info>  [1500730266.4789] dns-mgr: Writing DNS information to /sbin/resolvconf
[    Jul 22 19:01:06 ashoke-desktop dnsmasq[2557]: setting upstream servers from DBus
[    Jul 22 19:02:34 ashoke-desktop avahi-daemon[778]: Joining mDNS multicast group on interface eno1.IPv6 with address fe80::ceec:c245:d3a2:6680.
[    Jul 22 19:02:34 ashoke-desktop avahi-daemon[778]: New relevant interface eno1.IPv6 for mDNS.
[    Jul 22 19:03:22 ashoke-desktop NetworkManager[870]: <info>  [1500730402.9408] policy: set 'JobaB' (eno1) as default for IPv6 routing and DNS
ashoke@ashoke-desktop:~$

Best Answer

Your "default route" on your wired connection was incorrect. In one of your first screen shots you have it set to 192.168.29.255 when the whole time the correct default route should have been 192.168.29.1.

You can verify by referring to your early screen shot of enter image description here

and then looking at your last screen shot which is in your answer

enter image description here

If you tried setting the ip address to a static ip address then you may have entered the wrong information

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