I modified my /usr/share/X11/xkb/symbols/pc file. After doing so, my End and PgDn keys no longer work. I did not back up the file, but attempted to restore it manually with no results. Ctrl/Shift+End/PgDn still works, but End/PgDn doesn't register a key code in xkeybind or in my browser.
How do I reset xkb back to default?
I'm running Mint 18.
I've researched this extensively to no avail, and have found similar questions here, but no one with quite the same problem.