I collect the Default and rarely have an issue.
Same here, rarely (about twice yearly) I'll change Update Policy to the bottom option (Show All) just to see if any applies to me, most will be Level 4 updates that normally I either don't need, or doesn't apply to my system. Then will switch back to default.
Normally when a Level 5 Update is offered on Linux Mint, it's the Linux configuration itself, or a kernel update, both of which normally shows 'medium' urgency in the changelog.
Those who risks to choose the Update Policy to the most aggressive has the most risk of breaking their install, probably due to the number of unneeded Level 4 drivers that's installed (same with updating via Terminal). I see it like this, why would I be installing a bunch of ATI/AMD (or older Intel graphics drivers) on a newer system that has a NVIDIA card? Only an ignorant (or rookie) Windows user would do this, and their update policy pertaining to hardware isn't perfect either. although it's been quite some time since I've had Windows Update offer those for a different brand of graphics card. Unless the prior ones were improperly removed, there's a continually updated tool for cleanup when switching from AMD to NVIDIA or vice versa, or one chooses to run onboard graphics & no 3rd party GPU (few does this).
So for the most part, with Linux Mint, the majority of Level 4 updates are for drivers, and there's an above 50% chance on a modern computer that most, if not all, applies to no one. We get most of our needed hardware drivers either in the Linux ISO, as part of the initial update process or via the Driver Manager tab in the Administration menu, there will usually be one for either AMD or Intel CPU microcode drivers there. In the case of NVIDIA GPU drivers drivers, one should add the PPA for these as follows. Terminal lines in quote(s), note that both are to be separately ran (why I quoted separate).
sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt-get update
Source: ('D' & 'E') on following page.
Now go back to Administration > Driver Manager & then the correct NVIDIA driver will be shown (usually will be recommended choice). Look for that, on Linux Mint 'recommended' is in green print, although may often be 2-3 versions behind the Windows equivalent. This is because first, NVIDIA has to ship the driver, than the PPA team will decide if it's stable or 'bleeding edge', as well as having to take the time to recompile the driver. So that's why if dual booting or on a separate computer, one may have (as of date of this posting) version 381.65 on Windows & 375.39 on Linux, what's showing on my system now & just checked for updates. So that's probably like 4-5 versions behind, as not all of the minor drivers won't be included in the PPA.
Am going to double check to make sure I have the 'right' PPA, could have sworn that the last install had 378.xx installed.
EDIT: I did have the wrong PPA added previously, added the one above & now 'nvidia-381' is offered, had I not been posting here, wouldn't had caught it until who knows when.
If by chance the latest driver (denoted by higher number) gives troubles, go to the prior one, have had to do that several times.
Edited by cat1092, 19 April 2017 - 02:41 AM.