I think that installation was originally 18.04 and I installed it when it was released. A while ago anyways and I've been upgrading it as new versions roll out and with the latest upgrade and snapd software it has become more and more annoying to keep the operating system happy and out of my way so I can do whatever I need to do on the computer.
Snap updates have been annoying and they randomly (and temporarily) broke stuff while some update process was running on background, but as whole reinstallation is a pain in the rear I have just swallowed the annoyance and kept the thing running.
But now today, when I planned that I'd spend the day with paperwork and other "administrative" things I've been pushing off due to life being busy, I booted the computer and primary monitor was dead, secondary has resolution of something like 1024x768, nvidia drivers are absent and usability in general just isn't there.
After couple of swear words I thought that ok, I'll fix this, I'll install all the updates and make the system happy again. But no. That's not going to happen, at least not very easily.
I'm running LUKS encryption and thus I have a separate boot -partition. 700MB of it. I don't remember if installer recommended that or if I just threw some reasonable sounding amount on the installer. No matter where that originally came from, it should be enough (this other ubuntu I'm writing this with has 157MB stored on /boot). I removed older kernels, but still the installer claims that I need at least 480MB (or something like that) free space on /boot, but the single kernel image, initrd and whatever crap it includes consumes 280MB (or so). So apt just fails on upgrade as it can't generate new initrd or whatever it tries to do.
So I grabbed my ventoy-drive, downloaded latest mint ISO on it and instead of doing something productive I planned to do I'll spend couple of hours at reinstalling the whole system. It'll be quite a while before I install ubuntu on anything.
And it's not just this one broken update, like I mentioned I've had a lot of issues with the setup and at least majority of them is caused by ubuntu and it's package management. This was just a tipping point to finally leave that abusive relationship with my tool and set it up so that I can actually use it instead of figuring out what's broken now and next.
I have absolutely zero experience with btrfs. Mint doesn't offer it by default and I'm just starting to learn bits'n'bobs of zfs (and I like it so far) so I just chose it with an idea that I can learn it on a real world situation. I already have zfs pool on my proxmox host, but for that I hope I'd gone with something else as it's pretty hungry for memory and my server doesn't have a ton to spare. But reinstalling that with something else is a whole another can of worms as I'd need to dump couple terabytes worth of data to somewhere else in order to make a clean install. I suppose it might be an option to move data around on the disks and convert the whole stack to LVM one drive at the time, but it's something for the future.
I was a debian only user for a long time but when woody/sarge (back in 2005-2006) had pretty old binaries compared to upstream and ubuntu started to gain popularity I switched over. Specially the PPA support was really nice back then (and has been pretty good for several years), so specially for a desktop it was pretty good and if I'm not mistaken you could even switch from debian to ubuntu only by editing sources list and running dist-upgrade with some manual fixes.
So, coming from a mindset that everything just works and switching from a release to another is just a bit longer and more complex update the current trend rubs me in a very much wrong way.
So, basically the tl;dr is that life is much more complex today than it was back in the day where I could just tinker with things for hours without any responsibilities (and there's a ton more to tinker with, my home automation setup really needs some TLC to optimize electricity consumption) so I just want an OS which gets out of my way and allows me to do whatever I need to whenever I need it. Immutable distro might be an answer, but currently I don't have spare hours to actually learn how they work. I just want my sysVinit back with distributions which can go on for a decade without any major hiccups.