I run dual boot windows/ubuntu, nvme0n1p1 is efi system partition, p2-p5 are windows-reserved, and p6 is linux-swap.
Also, I didn't mention it in the post, but I recently grew linux partition up for around 16GB. I rebooted into windows several times after that, and everything was fine before the update.
/ and /home is just how I set it up.
/var seems to take up only 1.2 GB. I don't know, how can I check for any 'cruft'
spoiler
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