I started here: https://help.ubuntu.com/community/FilePermissionsACLs
I see that acl is enabled on all mounts on my disk by default, but $ mount | grep acl yields nothing.
I tried exlicitly enabling acl in /etc/fstab and remounting root, but this didn't work either.
Is it possible for acl to be working if mount doesn't show it? I clearly have an acl entry on a file but I'm getting permission denied.
user@host:~$ sudo tune2fs -l /dev/mapper/ubuntu--vg-ubuntu--lv
tune2fs 1.45.5 (07-Jan-2020)
Filesystem volume name: <none>
Last mounted on: /
Filesystem UUID: 6a12565d-9b50-4250-be1d-f7d9fe20461f
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum
Filesystem flags: signed_directory_hash
Default mount options: user_xattr acl
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 12156928
Block count: 48627712
Reserved block count: 2431385
Free blocks: 38642088
Free inodes: 11984210
First block: 0
Block size: 4096
Fragment size: 4096
Group descriptor size: 64
Reserved GDT blocks: 1024
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 8192
Inode blocks per group: 512
Flex block group size: 16
Filesystem created: Mon Mar 14 19:39:19 2022
Last mount time: Thu Apr 28 12:21:11 2022
Last write time: Thu Apr 28 12:21:10 2022
Mount count: 8
Maximum mount count: -1
Last checked: Mon Mar 14 19:39:19 2022
Check interval: 0 (<none>)
Lifetime writes: 161 GB
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 256
Required extra isize: 32
Desired extra isize: 32
Journal inode: 8
Default directory hash: half_md4
