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Asked: 2024-09-25T18:16:12+05:30 In:

What could be the cause of encountering an “errno 30” error indicating a read-only file system on my Ubuntu machine, and how can I troubleshoot or resolve this issue?

So, I ran into this really annoying issue on my Ubuntu machine the other day, and I’m hoping someone here can help unravel the mystery. I was trying to save a file when suddenly I got hit with this “errno 30” error that said something about a read-only file system. At first, I thought it was just a little hiccup, but it kept happening every time I tried to write anything to the disk.

I did some digging around on the internet, and it seems like “errno 30” is a pretty common error message that basically means the system is in a state where it’s too scared to let me make any changes to the file system. Some articles mentioned it could be due to a range of issues, from accidentally mounting my file system in read-only mode to potential problems with the hard drive itself. Honestly, it’s a bit overwhelming trying to figure it all out!

I checked to ensure the file system isn’t mounted as read-only. I’m pretty sure I’m not doing anything super crazy that would make it read-only. But then I started wondering: could the drive be failing? I’ve noticed some lag recently, and it’s got me worried that my data could be at risk. That can’t be good, right?

And then there’s the whole aspect of permissions, which I admit I don’t fully understand. Is it possible the user permissions have somehow been messed up? Or maybe there are files that were set to be read-only without me even knowing?

So, if anyone here has faced an “errno 30” error or any similar issues, how did you tackle it? It’s super frustrating being locked out of saving my work. I’d love to hear what you did to troubleshoot and resolve this problem. Also, if there are any commands or steps I should try to diagnose the issue further, I’m all ears! Your insights would be super helpful as I try to get my system back in working order. Thanks!

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    2 Answers

    1. Wow, that sounds really frustrating! “errno 30” is definitely not what you want to see when you’re just trying to save your work. I’ve had my share of headaches with file system issues too, so I totally get where you’re coming from.

      First off, it could be that your file system did indeed get mounted as read-only. It’s worth checking with the command:

      mount | grep 'on / '\

      This will show you how your root file system is mounted. If you see “ro” (read-only), then there’s your culprit!

      If it’s mounted correctly, then it might be a hard drive issue, especially if you’ve noticed lag. You can check the health of your drive with:

      sudo smartctl -a /dev/sdX

      Replace sdX with your actual drive (like sda, sdb, etc.). Look for any errors or failing status in the output.

      As for permissions, you can check if you have permission to write to that directory/file with:

      ls -l

      If it shows r-- for your user, that’s definitely an issue. You may need to change the permissions using:

      chmod +w

      This adds write permissions.

      If none of this helps, you might wanna try rebooting your system. Sometimes a simple restart can resolve odd states like these.

      Hope this helps a bit! Just take it step by step, and you’ll get to the bottom of it!


    2. The “errno 30” error you’re encountering typically indicates that the file system is mounted in a read-only state, which can happen due to various reasons. Before assuming a hardware failure, double-check the mount status of your file system by using the command mount | grep -E 'on /.*type' to see if it explicitly shows that it’s read-only. If it’s mounted as read-only, you may want to consider remounting it with write permissions using sudo mount -o remount,rw /your/mount/point. However, keep in mind that this could potentially lead to data loss if there is indeed an underlying issue with the drive or filesystem. Checking the system logs with dmesg or tail -f /var/log/syslog can also provide insights into why your system might have entered this state.

      If you suspect that your drive might be failing, it’s critical to run a health check using smartctl. Install it using sudo apt install smartmontools, then execute sudo smartctl -a /dev/sdX (replace sdX with your actual drive identifier) to inspect the drive’s status. Additionally, reviewing file and directory permissions can help diagnose any issues arising from them. Use ls -l to check permissions and chmod or chown to adjust them as necessary. Make sure that your user account has the appropriate configurations to modify files. If the problem persists, running fsck to check and repair the filesystem may be necessary, but ensure to unmount the filesystem first or boot into a recovery mode to run it safely. Stay cautious and back up critical data to prevent data loss as you troubleshoot.


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