Reality Check:
I got a notification I had a two kernel upgrades waiting in que, the original and the major fixes reissuance due to issues that were found during original roll out. Ths was stated as two full kernel upgrades after it went through Ubuntu and then the Mint adoption processes.
Every support package was listed twice as they all got upgraded twice (building one on the other). Both my browsers were there, with Firefox getting triple pumped due to its own internal changes as the Linux kernel related items only got double pumped.
All my graphics this and that got at least one upgrade. Ditto for the Libre Office and other major softwares.
Since I have been on Linux Mint, this is the biggest single update package I have ever seen come over the wire, ever.
I noted the time and started it installing. Including the one hard reboot at the end, the entire thing took 6 minutes to do, complete. Amazing .....
Folks, in the days of 2400 baud modems it took me half a day just to download all the raw software. My main C: drive SSD really does make the largest difference in update speeds, as it can read and write the changes about as fast as the screen can keep up with the stuff flowing through the high speed cable modem.
Six Minutes to install a really major update ......... only one (1) hard reboot at the end.
Modern Linux Mint, ya gotta love it. Let's look forward a bit to when 4 threads per core SMT becomes real, as you know it will happen on Linux first. Assuming (a big ASSume here on this one) that my old Core DUO will be supported on the first wave, I will suddenly be "thread count equivalent" to just about all the windows running Intel processors from the last 15 years or so.
Not bad for my old aging dual core rag-a-muffin Dell box.
Now, looking forward to the future there is a Linux software shift coming right at you ...... lots of older packages like Flash are getting dropped by the distros and the general recommendation is now to do a separate media full install (usb preferably, DVD if you must) on your next update.
Many of you who have Timeshift installed and working have noticed that your boot media (hard drive) is getting sorta full ---- this is because you are backing up some bigger and bigger over the air updates as the system sees them as changes that must be backed up. Plus, your old stuff and old games and all the other detritus you have built up over the years are bulging your waistline more and more .......
As I look at my stuff, I see things that I might not even bother reinstalling as I seldom if ever use them. So a general housecleaning isn't a bad thing for me.
In any case, Linux Mint is forcing you to do a clean install between 19.3 and 20.0 because the changeover in operating system modes itself is causing some minor breakage. Silly stuff, like wifi breaking repeatedly ....... still, no point in going there as a clean install off of media avoids all these problems.
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WARNING !!!!Ubuntu has made a right mess of this 20.04 LTS main distribution. Stay on Mint 19.3 until late next year at the very earliest ---
do not do the 20.04 upgrade right now.Clem apologizes for the huge rat's nest Ubuntu has gifted him with. This clusterfook will likely cause some folks to turn away to other distributions
as Mint can't fix it right now because it is still broken inside Ubuntu. And Ubuntu is foundering around, regressing this and that and basically messing it up weekly (differently each time) making it even worse and worse.
You get current instructions to go to menu>system>passwords to fix an item ....... so you click menu>system>passwords --- and it isn't there any more !!! It is somewhere else now !!!
Periodically, Mint discusses leaving Ubuntu as an operating basis and one time that I can remember it got serious enough for Clem and group to actually roll out a Mint variant based on Debian Rolling Stable (the stuff Ubuntu is based upon) ...... and we may be there again very soon if Ubuntu cannot get their act together any better than they are doing right now.
I repeat .....
DO NOTHING ..... DO NOT UPGRADE TO MINT 20.04 AT THIS TIME. We are promised that 20.1 will get better and that most of the way through the next 20.2 period there will be a PAINLESS automatic upgrade path from Mint 19.3 to 20.2 provided by the Mint folks. Yep, it will take that long for Ubuntu to quit wiggling all over the place.
Having been through the current painful fix it yourself method, I recommend WAITING until Clem's automatic method is all proven out.