I killed the fox many times before when it hang my system

Fair enough. I've only created a visualization tool, I haven't gathered statistics.

I'm using a tiling window manager and neovim as my main editor, so I have to use hot-keys quite a lot As for the caps, I have it remapped to control

Yeah, it is on my keyboard

Very nice!

What do you mean by immutable though?

I'm using btrfs When I grew the partition, I only used GParted

I zeroed all the files in /var/log, but it had practically no effect on the disk usage

lsof -a +L1 / lsof -a +L1 /home

No, the output of these commands is empty. U also tried running with +L, in both cases most of the files were ~100Kb, largest was telegram in /opt with 150Mb.

Is it safe to remove /var/log? I almost never read logs anyway

Running sudo apt-get autoclean && sudo apt-get autoremove was the first thing I tried.

I am not sure, how do I interpret output of apt-cache stats?

Total package names: 126893 (3,553 k)
Total package structures: 122145 (5,374 k)
  Normal packages: 81989
  Pure virtual packages: 2797
  Single virtual packages: 22954
  Mixed virtual packages: 2708
  Missing: 11697
Total distinct versions: 101553 (8,937 k)
Total distinct descriptions: 180829 (4,340 k)
Total dependencies: 609988/159599 (14.8 M)
Total ver/file relations: 32564 (782 k)
Total Desc/File relations: 49757 (1,194 k)
Total Provides mappings: 50727 (1,217 k)
Total globbed strings: 239740 (5,895 k)
Total slack space: 65.4 k
Total space accounted for: 47.7 M
Total buckets in PkgHashTable: 196613
  Unused: 109956
  Used: 86657
  Utilization: 44.0749%
  Average entries: 1.40952
  Longest: 17
  Shortest: 1
Total buckets in GrpHashTable: 196613
  Unused: 103120
  Used: 93493
  Utilization: 47.5518%
  Average entries: 1.35725
  Longest: 8
  Shortest: 1

Thank you!

It worked without any problem.

Kind of, it's called zathura

I choose the earliest stage, because it's quicker to clear them