Hi, I don't think that I'm a complete beginner any more - maybe pre-intermediate! - but I need serious advice just now.
I installed 18.04 on this dual-booting desktop a couple of months ago. I had put 20.04 on there, but was having problems getting a graphical add-on to work (Cairo Dock, to be specific), so reverted back to 18, where I knew at least that it worked. Things were mostly fine to start with, but in the last couple of weeks I've been seeing some quite frustrating behaviour. I see the "problem detected" popup quite a lot, especially just after restarting, but don't know exactly what the problem(s) is/are. I guess that I would like to know where to look in order to investigate properly myself.
It's not just minor annoyances - there's serious instability there. Quite often the screen freezes in the middle of doing things, and there's no response to mouse or keyboard, so all I can do is hit the power button. And nobody likes doing that. Other dodgy behaviour: certain apps have been failing to open sometimes - most commonly Spotify and Skype, but it also happened to Chromium for a while (in fact I've now got two instances of Chromium installed because of that, which is a bit confusing). Most disturbingly, though, I'm getting failed starts where I have to run fsck on the drive to check for errors. Thankfully I'm learning a bit from all this, and am able to get back to the login screen, but of course I don't want it to be doing that all the time (well, it's happened at least a few times already).
So - what do I do about this? Where do I go to check log files, and which needle will I be looking for in that haystack? And is it all worth it? That is to say - should I just accept that I'm going to have to upgrade to more recent versions if this particular system is so unstable? And if so, is the upgrade process guaranteed to go smoothly given what has been happening? I've seen problems with upgrades in the past. In the worst case, I've got the home directory backed up, plus a package list.
Enough for now. Thanks very much for any help
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