Thanks for the help, @ryecoaaron, that seems to have done the trick! No more errors when popping into the Docker service. I really appreciate your help!
I'm relatively new to Linux, and am really curious what that process did. From what i could gather, it looks like the touch command tells the OS to update the file's "last updated" metadata to that moment.
Then the apt-get -f install seems to look for broken dependencies and tries to fix them. Interestingly, the output of that command showed that nothing was changed. Yet something definitely fixed the problem.
If it's not too much trouble, I'd love to learn the mechanics behind what that did.
As far as the 'yuck' in response to it being an RPi, is that because it's so underpowered that it makes for a less-than-optimal NAS experience? If so, I totally get it. It does make for a fun, inexpensive platform to learn on, though.
Thanks again!