Peripherals don't work (Ubuntu 18.04)

I upgraded to Ubuntu 18.04 yesterday.
When it finished the installation, I went on to pick a user. Both the keyboard and the mouse worked perfectly on that screen. After logging in and went into the desktop, neither the keyboard or the mouse were working.
I decided to boot into Windows 7 to see if they would work there. Both worked with no issues. I've tried rebooting into Ubuntu a bunch of times with no luck.
What can I do to solve this problem? Any help is greatly appreciated!

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