chown operation not permitted on sdcard folders

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I installed Armbian Bionic Desktop 4.4 on the emmc module and I also have an SD card in.


When I get to the desktop the card looks like it has been mounted by the current user (I'm new to Linux) - it was listed under /media/myuser with myuser as user and group -,  so I changed /etc/fstab to have it mounted during system boot, by adding:


    /dev/mmcblk0p1 /mnt/sdcard


This is what lsblk says:


    mmcblk1      179:0    0 14.7G  0 disk
    └─mmcblk1p1  179:1    0 14.5G  0 part /
    mmcblk1boot0 179:16   0    4M  1 disk
    mmcblk1boot1 179:32   0    4M  1 disk
    mmcblk1rpmb  179:48   0    4M  0 disk
    mmcblk0      179:64   0   29G  0 disk
    └─mmcblk0p1  179:65   0   29G  0 part /mnt/sdcard


I noticed that the following gives an error:

$ ls -l /mnt/sdcard/
drwxr-xr-x 5 root root 32768 Apr 12 20:22 kubernetes

$ sudo mkdir /mnt/sdcard/test-dir

drwxr-xr-x 5 root root 32768 Apr 12 20:22 kubernetes
drwxr-xr-x 2 root root 32768 Apr 13 17:29 test-dir

$ sudo chown myuser:myuser /mnt/sdcard/test-dir
chown: changing ownership of '/mnt/sdcard/test-dir': Operation not permitted

Is it expected? Or do I have to do anything else?


I did this because I'm trying to deploy a PostgreSQL image in a Kubernetes cluster and I'm continuosly getting this same error, and after every configuration I found online didn't work, I wanted to try the command explicitly.




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4 hours ago, Werner said:

Is this dir immutable? Check lsattr


It said


lsattr: Inappropriate ioctl for device While reading flags


but it was due to the FAT file system; now that I formatted it to Ext4, it gives:

--------------e--- /mnt/sdcard/kube-postgres



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