Dont edit file system

linhdong · April 21, 2020, 10:38am

I tried to create a file or edit a file, and it all said it was read only file system. Although I used sudo or chmod 777. But nothing could be done. How to solve this problem?Thank you everyone

mhog · April 21, 2020, 3:10pm

Hello!

First I must admit I don’t have BPi-R2/R64, but I want try to help you. Things to check:

Did you flash an clean image?
Do you have something modified?
Can you look at /etc/fstab?

cat /etc/fstab
If there’s a line with something called ‘ro’, then we found the problem.
Maybe you can try ‘sudo mount -o remount,rw /’, but there could be one more problem: You can’t use sudo you just said. If you can, then you can try to edit /etc/fstab and remove the line (exactly the following, not the whole line): ‘errors=remount-ro’ or something with ‘ro’
Because interfaces.swp is essentially a swap file, then you can try ‘sudo swapoff -a’. This turns off the swap-file and then try to edit the file.
Last question: Is the whole filesystem locked, because of read only? Or is it only that file? If I read your text, then I think the whole filesystem. Maybe you can send one more photo from another file/folder.
One thing you can try too, is try to read the micro-SD from a Linux computer if you’re running your operating system from your SD. Maybe you can write from that PC. Then it’s probably /etc/fstab if you can read it.

I like to hear more from you soon.

Have a nice day!

mhog

frank-w · April 21, 2020, 7:15pm

Which image you are using?

Please post output of mount-command (without arguments)

linhdong · April 22, 2020, 7:49am

this is here. version:BPI-M4/BPI-W2 Ubuntu Server 16.04 2019-08-23-ubuntu-16.04-lite-preview-bpi-r64-sd-emmc

linhdong · April 22, 2020, 7:50am

thank you so much.i will check it

mhog · April 22, 2020, 7:52am

Your root filesystem is mounted ro. Can you post output of

cat /etc/fstab

mhog · April 22, 2020, 7:55am

I’ll take a look at the image you send. Maybe I can find a fault within the image.

linhdong · April 22, 2020, 7:59am

in case 7 : I think all the files are the same.

linhdong · April 22, 2020, 8:00am

this is here

mhog · April 22, 2020, 8:00am

Can you please post the output of

cat /etc/fstab

??

I will take a look at the output, maybe there’s some line with ro

mhog · April 22, 2020, 8:01am

thank you! I don’t see a line with ro

Can you run

sudo mount -o remount,rw /

??

mhog · April 22, 2020, 8:02am

And then post output of

mount

linhdong · April 22, 2020, 8:02am

image.png1103×120 14.5 KB

mhog · April 22, 2020, 8:04am

That’s weird. Can you reflash the image? Then we have a clean start.

You can backup current image with dd

In the image I don’t see any line with ro

But I see /dev/mmcblk0p2

It’s better to use UUID in image (/etc/fstab), because /dev/mmcblk0 changes sometimes.

linhdong · April 22, 2020, 8:04am

Maybe the problem is with the image?

mhog · April 22, 2020, 8:06am

It’s possible. Do you have errors with the SD card when you boot? Sometimes a power corruption can damage the SD and/or installation of the image. But I want to make sure it’s not the SD/installation. I will in the meantime take a look at the image. I’ll take a look if I can see that can cause any possible errors.

mhog · April 22, 2020, 8:07am

Maybe we can create a new image of this one and make it better work. Can you in the meantime reflash the image? Then we have a clean start… But take a backup before reflashing if the image is important to you…

linhdong · April 22, 2020, 8:10am

I just reset it. but

mhog · April 22, 2020, 8:10am

I’ll try to change the UUID of image. I’ll send it to you when I’m ready. Do you want to test it out then?

mhog · April 22, 2020, 8:10am

It’s not mount ro anymore I see. Can you edit files?