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Apologies if I overlooked this in the docs somewhere. Let me document something just incase it was missed.

My upgrade from 12.04 to 14.04 pauses on a package configuration. The first time I did this I found it to be stuck on a screen saying <Ok> to continue. It seemed unresponsive as I was unable to choose "Ok" with the tab or by way of the mouse and unable to proceed. I hacked around that the first time by guessing and killing that process. This time, I came to my senses and finally figure out that I could hit tab 3 or 4 times to select "<Ok>" then press Enter (I did not screen shot that screen). So, this should be documented somehow, I would be concerned for anyone upgrading.

So, if you unable to select "<Ok>" .. tab repeatedly until it gets selected then press enter.

Now I'm faced with a choice below but I don't know what the implications are. I have gdm installed but I will go with unity. I don't see a link between Unity and lightdm.

What are the implications of choosing either?

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LightDM and GDM are Display Managers. If you choose one over the other, the login screen you get differs. That's about it from an end-user perspective. You can always choose the Display Manager by running:

sudo dpkg-reconfigure lightdm # or gdm

You will be presented with a dialogue like the one you have been shown now, and you can select which ever one you want.

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