Blender 2.83 crashed because I pressed Ctrl + Z one too many times (this pitfall is still a thing. At this late stage. Yes). Now one of my more recent User Preferences hotkey changes is reverted to the default. Maybe more have reverted also, but I don't yet know the extent of this annoyance.
I know better than to expect to enjoy a crash-free Blender experience. But at the very least, I want to enjoy a shortcut losing-free experience. So I want to know how to prevent the need to manually rebuild these shortcuts. I know there is a User Preference file somewhere that could probably be re-loaded, provided I had a backed up version located somewhere else. I would create one, if I knew where the User Preference file is stored. But I don't. I don't even know what the exact file I'm needing is called. I'm running Ubuntu Studio 19.10, and I don't know where to look for this file.