I started baby steps when Steam stopped supporting Windows7. I built my main gaming PC to dual boot W10 & Ubuntu maybe 3 years ago? And that just worked so-so honestly. Felt like everytime I went to play co-op games w my friends, whatever game we picked that weekend didn’t work correctly in Linux. But because I had Win10 right there, I also never forced myself to learn anything either. Biggest thing I could find was the problems seemed to be related to the Nvidia drivers, but never could quite figure out how to update them.
Recently I doubled down with a new PC, and this time it’s Ubuntu only. Made an effort to find native Linux apps where possible, learned a few terminal commands, forced myself to also learn Bottles (play Windows games), and bought a Radeon video card instead of Nvidia. Learning curve for what I wanted wasn’t nearly as high as I feared. If anything, I think it’s pushing me to consider distro shopping, as I’m starting to understand why folks don’t like snaps. Looks like Mint will be my next stop.
Biggest challenge so far is there’s a few apps I use that just don’t have a great Linux equivalent. AutoHotKey is the biggest one, but I see there’s some new options here I didn’t try yet. https://lemmy.zip/post/47337622 I have not dicked around with my 3D printer software yet, but I’m sure that will be a hurdle.
I think you already have your answer, but let me elaborate a bit.
The places in the middle where the filament is missing - those places are either dirty or too high.
The area in the back where the filament is sticking, but isn’t filling the area correctly, those areas are too low.
Most likely cause for both is the build plate on an Ender just isn’t perfectly flat. You can try to adjust it to get it closer to being level. But I’ve always found I’ll have sections that just aren’t right. And so, I just don’t print on those sections. Find the areas that do print well, and locate your prints there.
Last note - try putting down a layer of painter’s tape. I find that helps tremendously with both of the points you’re fighting.