Interesting (though confusing for a newbie) thread.
When I updated this morning I saw the same problems you all had stated above. (Fix Broken packages).
I choose to update and let the update uninstall VLC and install "libva1". I figured update knew better than me, and that it ( the new VLC) would come along later. I assumed that the new "libva1" was used in more than just VLC, perhaps other multimedia software (Mplayer?, Totem?). No worries.
BUT, this thread just added confusion on whether to accept NEW "config" files or not. I have two installations of LMDE set up the same. One daily user, and one that I use as a "test" (I dowload ALL 1-5 updates there first to "test" to see if anything breaks.). I have downloaded ALL updates since install, and nothing has broken. I use the Liquorix kernal, there have been around 5-6 updates to it since I installed, but no breakage there either, all runs smooth.
I wish someone would really clarify accepting config updates!
Also, I use Mint Update Manager. Levels 1-5. I read above that this is not the preferred method, as it may miss something.? I must say that I don't think it does. I recently have also been checking synaptic "Mark all Upgrades" after using mint update, and there is nothing new there. I think that Mint Update does the trick, but I really would like to see some clarification on this as well.
I must say that LMDE is easier to use and maintain than I expected (only started on Linux about 6 months ago).
But, I find a lot of contradictory (but always helpful

) info on the forum. Experienced users seem to not like to use GUI's at all. And most of us new folks are still a bit intimidated by the CLI.
As mentioned, Mint Update works just fine for me. I think just as well as using the CLI commands, or synaptic. I sure would like to see some definitive clarification on this and accepting config updates.
Thanks.