When I shifted to LMDE, I went to do the updates. Only Level 3 and above were allowed to come through by default. I adjusted it so that I could see (Visible) the Level 4 and Level 5 updates. I install them as I see fit.
Don't know if this helps or not, but this is the way I did it. Others have allowed the Level 4 and Level 5 updates to come through, but backup prior to running the Level 4 and 5 updates. From what I can gather, this is just in case of major borcage.
Linux User: 528038
Primary PC: Version: LMDE (201101), 32 Bit.
Alternate 1: Version: Peppermint One OS, 32 Bit.
Laptop: Version: Julia Main (10), AMD 64