[SOLVED] Ubuntu disk space usage after upgrade from 20.04 to 22.04
Hello, everyone. Recently I finally decided to update my system, and right after the update ran into a problem: before update baobab showed ~22 GB avaliable space, and after the update it went down to around 8.
a lot of other stackoverflow posts, all having similar answers, that didn't help me
I tried some methods to locate what consumes all the space, but couldn't figure it out.
Also, the problem seems to be getting worse (right now baobab shows only ~5GB avaliable space).
Can you help me find the source of the problem (and ideally also help me solve it :) )?
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?
spoiler
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
A reboot will make whatever processes that are still using those deleted files let go of them. Maybe that solves your problem. If not, ncdu will help you find large files and directories.
I've already tried rebooting (as mentioned in the post, I've run GParted 'check' from liveUSB, reboot after. Also, I've done it seperately). And ncdu shows basically the same result as baobab — it doesn't add up to 93% disk usage from df
I was finally able to find the issue. Thanks to @[email protected] 's question regarding my filesystem type, I decided to look into it.
I use btrfs, and this command showed me, that I have a lot of snapshots made by apt.
$ sudo btrfs subvolume list -s /
...
ID 318 gen 2617038 cgen 2566262 top level 5 otime 2024-02-13 06:59:10 path @apt-snapshot-release-upgrade-jammy-2024-02-13_06:59:10
It was probably possible to determine how much space each of them was occupying, but I decided to simply delete them all and be done with the issue. So I installed apt-btrfs-snapshot and run delete-older-than 0d.
As a result, I now have 29 Gb and no backups, which is fine with me.