Still running 18.3, have been for almost 4 years now, no updates required, no problems at all. :)
I started using Linux Mint with 16.0 and upgraded to 17.3, then 18 and 19.3. I like all of the new features. Linux Mint 20 is rock solid. Here is what I am currently running: Kernel: 5.4.0-52-generic x86_64 bits: 64 Desktop: Cinnamon 4.6.7 Distro: Linux Mint 20 Ulyana. Everything works! There are a lot of minor updates, but that is a good thing. Many code developers in the open source community writing and improving the software. I can use Python and Gfortran and write code, with the latest versions. I broke free from MS when Win XP died and have never looked back. Here is the system that is SOLID!
al@al-Metal:~$ neofetch
...-:::::-... al@al-Metal
.-MMMMMMMMMMMMMMM-. -----------
.-MMMM`..-:::::::-..`MMMM-. OS: Linux Mint 20 x86_64
.:MMMM.:MMMMMMMMMMMMMMM:.MMMM:. Kernel: 5.4.0-52-generic
-MMM-M---MMMMMMMMMMMMMMMMMMM.MMM- Uptime: 1 hour, 12 mins
`:MMM:MM` :MMMM:....::-...-MMMM:MMM:` Packages: 2577 (dpkg), 6 (flatpak)
:MMM:MMM` :MM:` `` `` `:MMM:MMM: Shell: bash 5.0.17
.MMM.MMMM` :MM. -MM. .MM- `MMMM.MMM. Resolution: 2560x1440
:MMM:MMMM` :MM. -MM- .MM: `MMMM-MMM: DE: Cinnamon
:MMM:MMMM` :MM. -MM- .MM: `MMMM:MMM: WM: Mutter (Muffin)
:MMM:MMMM` :MM. -MM- .MM: `MMMM-MMM: WM Theme: Mint-XP-Metallic (Esco)
.MMM.MMMM` :MM:--:MM:--:MM: `MMMM.MMM. Theme: Mint-X-Blue [GTK2/3]
:MMM:MMM- `-MMMMMMMMMMMM-` -MMM-MMM: Icons: oxygen [GTK2/3]
:MMM:MMM:` `:MMM:MMM: Terminal: gnome-terminal
.MMM.MMMM:--------------:MMMM.MMM. CPU: AMD Ryzen 3 2200G (4) @ 3.500GHz
'-MMMM.-MMMMMMMMMMMMMMM-.MMMM-' GPU: AMD ATI Radeon Vega Series / Radeon Vega Mobile Series
'.-MMMM``--:::::--``MMMM-.' Memory: 2538MiB / 13985MiB
'-MMMMMMMMMMMMM-'
Good Hunting... from Varmint Al