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Everything below relates to a Ubuntu Server 12.04 OS.

So, I created a VM at work (which needed a proxy). I went and edited the /etc/environment file, and added in the proxy information.
This worked fine, and I was able to connect to the network, and internet.

I then made an export of that VM image to take home.

I import the image on to my home computer which doesn't need a proxy.
I removed only the lines I added earlier in the /etc/environment file.

For some reason I can't connect to my network. Any ideas why?

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Did you check if your network device was up? If not, check /etc/udev/rules.d/*persistent-net.rules.

This is a persistent issue with Ubuntu and migrating vms: http://stateless.geek.nz/2007/02/01/ubuntu-and-vmware-losing-your-ethernet-device-when-migrating/#idc-cover

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