Cannot mount disk partion

Dear Ubuntu experts,

During the samba network share I was copying files and got lost of one disk partition and cannot mount any more. Hard-drive are splitted in to 4 partition, after an unexpected error 1 partition cannot be mounted. By checking fdisk all 4 partitions are listed.

Please advise how can I repaire partition without loosing the data.
How to save data from unmountable partition.

“sudo e2fsck /dev/sda3e2fsck 1.42.12 (29-Aug-2014)/dev/sda3 has unsupported feature(s): metadata_csume2fsck: Get a newer version of e2fsck!”

Just as an aside, have you tried logging into a live session with the UM ISO and tried mounting the problem partitions from there? If nothing else, this will at least give you the opportunity to rescue files off them.

Hi,
Thanks for prompt response.
Can you please advise more detailed couse sorry but I’m not familiar with this function (program)
Do you have website with manual to read???

The ISO you installed UM with allows you to choose, when you boot from it, to either directly install or to go to a “live” session. This is a fully functioning UM desktop that is running directly off the ISO. You should have full administrator rights in a live session such that you should be able to go to the places menu and choose “computer” and all your internal drives should be listed. You just then need to double-click one of them to see if it mounts and opens. If it does, then you should be able to copy any files off it and onto a separate external usb. All of this is done whilst in the “live” session. Once done, you can then choose to wipe the internal hard drive and reinstall UM.

Here is a link to the main Ubuntu web page for using a live session. However, it is for the normal Ubuntu, not Ubuntu Mate. Nonetheless, much of the information applies to both versions of Ubuntu:

https://help.ubuntu.com/community/LiveCD

The thing is that this partition is from external USB drive. And UM is runing on Raspberry Pi.
I tried also to run Raspberry original NOOBS and its the same all partitions mount except the this one.
I tried to connect the drive on Windows and OSX machines but couse its ext4 partitions either Windows or OSX will mount the drives.

As it’s the external USB maybe there is solution on other operating systems to extract data from broken partition?

Hello @Saulius2006

I can think of several things but let’s stick to the defaults.

There is a *NIX emulator for Windoze which you can find here: https://www.cygwin.com/

It’s a very basic program that allows you to access win just like if it would be a Linux system. That could possibly help you.

OSX should mount the EXT4 drive and is for sure compatible with that FS.

However if your partition is broke and issuing fsck did not fixed it, it’s possible that your HDD is the problem in which case running a SMART test on it is quite possibly to easiest way to isolate where the problem resides.

Rewinding back 1 step, on your Raspberry Pi system on which you have mounted your drive, after you’ve plugged it in, what is shows at the end of the “dmesg” command?

Hope this helps,