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I installed Ubuntu 14.04 LTS on a Inspirion E1505 and when I booted to the install drive it recognized the Internet just fine. Now that I have it installed, not so much. When I run ifconfig it only returns lo. When I run:

sudo nano /etc/network/interfaces

it only returns: 

auto lo
iface lo inet loopback
andrew.46
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Colin Giles
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  • if you run `apt-cache policy network-manager` and the version installed, denoted by prepended `***`, is from `trusty-proposed` and is at version `0.9.8.8-0ubuntu7.2`, you could add `14.04` tag and check if your question is a duplicate of [#727127](http://askubuntu.com/questions/727127/last-upgrade-crashes-network-manager-no-internet-connection-no-applet) – r2rien Feb 02 '16 at 23:54

2 Answers2

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I've had similar problems in the past. Often adding auto eth0 to the end of /etc/network/interfaces does the trick.

element15
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If sudo lshw -C network shows that you have an eth0 (You may have to sudo apt-get instal lshw), add iface eth0 inet to /etc/network/interfaces

waltinator
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