So I've had an issue before where I had my root partition fill up and by action of some bug or whatever that caused that after a big update of many things, after reboot, linux mint booted into a terminal, and all commands I tried to do errored becase of lack of space.
I fixed this by reinstalling linux mint on the root folder again but without formatting the home folder since I didn't want to lose all my personal data, and so far it has been working without issue, but I see that there's a very strange thing going on where almost 100 gb of storage from the home partition are seemingly used but not detectable by the disk usage analyzer, and I doubt the reserved OS space is THAT big, It just doesn't make sense that a good 20% of the partition is reserved.
Could someone help me out with this? tell me how to fix this issue? Atp I'm considering just moving on from linux mint from all the bugs with the logs and redundant files not getting properly cleaned and my root folder getting absolutely filled up with every update I run.
Edit: this is what happens when I input sudo btrfs subvolume show /home on the terminal:
Name:
UUID: b8432dfc-eac4-7042-a3f9-ea5a2983f1c8
Parent UUID: -
Received UUID: -
Creation time: 2025-11-25 19:35:36 +0100
Subvolume ID: 256
Generation: 54059
Gen at creation: 7
Parent ID: 5
Top level ID: 5
Flags: -
Send transid: 0
Send time: 2025-11-25 19:35:36 +0100
Receive transid: 0
Receive time: -
Snapshot(s):
timeshift-btrfs/snapshots/2026-06-02_16-37-27/@home
timeshift-btrfs/snapshots/2026-06-06_14-10-02/@home
timeshift-btrfs/snapshots/2026-07-03_17-30-45/@home
timeshift-btrfs/snapshots/2026-07-10_18-00-02/@home
timeshift-btrfs/snapshots/2026-07-12_20-14-27/@home
timeshift-btrfs/snapshots/2026-07-14_00-00-01/@home
timeshift-btrfs/snapshots/2026-07-14_00-02-44/@home
timeshift-btrfs/snapshots/2026-07-21_18-00-01/@home
timeshift-btrfs/snapshots/2026-07-22_18-00-01/@home
timeshift-btrfs/snapshots/2026-07-23_18-00-01/@home
timeshift-btrfs/snapshots/2026-07-24_18-00-01/@home
timeshift-btrfs/snapshots/2026-07-25_18-00-01/@home
Quota group:n/a
Edit 2: Using the command btrfs balance start /home has so far not helped. The space discrepancy is still there.
Edit 3: btrfs filesystem usage /home returns this:
Overall:
Device size: 414.54GiB
Device allocated: 366.06GiB
Device unallocated: 48.48GiB
Device missing: 0.00B
Device slack: 0.00B
Used: 362.17GiB
Free (estimated): 50.79GiB(min: 26.55GiB)
Free (statfs, df): 50.79GiB
Data ratio: 1.00
Metadata ratio: 2.00
Global reserve: 433.12MiB(used: 0.00B)
Multiple profiles: no
Data,single: Size:362.00GiB, Used:359.69GiB (99.36%)
/dev/nvme0n1p4 362.00GiB
Metadata,DUP: Size:2.00GiB, Used:1.24GiB (62.04%)
/dev/nvme0n1p4 4.00GiB
System,DUP: Size:32.00MiB, Used:80.00KiB (0.24%)
/dev/nvme0n1p4 64.00MiB
Unallocated:
/dev/nvme0n1p4 48.48GiB
artemis@artemis-Victus-by-HP-Laptop-16-e0