I encountered a very strange problem a second ago with a new install of Ubuntu.
My git commands weren't auto-completing (which sucks when you're used to having them).
Anyway, after some playing I've cracked it. Here's how you can enable the auto-complete for git commands in the terminal.
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$ nano ~/.bashrc
Navigate to the bottom of the file and add this line
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source /etc/bash_completion.d/git
We've added the core bits here. To refresh the changes (on the fly) type the following into the terminal:
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$ source ~/.bashrc
Now, exit your terminal and go back in. Try typing:
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git checko
And now, press tab :) Done.