I got this message in GParted when seeing information about a partition that is marked with the yellow warning icon in the partition list:

e2label: No such file or directory while trying to open /dev/sda6

Couldn't find valid filesystem superblock.



Couldn't find valid filesystem superblock.



dumpe2fs 1.42 (29-Nov-2011)

dumpe2fs: No such file or

directory while trying to open /

dev/sda6



Unable to read the contents of this file system!

Because of this some operations may be unavailable.



The cause might be a missing software package.

The following list of software packages is required for ext4

file system support: e2fsprogs v1.41+.

I've checked that e2fsprogs is already the newest version. This is the result of ls /dev/sda*:

/dev/sda  /dev/sda2  /dev/sda5  /dev/sda7

There's no /dev/sda6, but this is the result of sudo fdisk -l:

Disk /dev/sda: 120.0 GB, 120034123776 bytes

255 heads, 63 sectors/track, 14593 cylinders, total 234441648 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk identifier: 0x48350995



   Device Boot      Start         End      Blocks   Id  System

/dev/sda2        61239296   125128703    31944704   83  Linux

/dev/sda3       125130751   234441628    54655439    f  W95 Ext'd (LBA)

/dev/sda4        52854784    61239295     4192256    7  HPFS/NTFS/exFAT

/dev/sda5       125130752   204957263    39913256   83  Linux

/dev/sda6       204957333   232315956    13679312   83  Linux

/dev/sda7       232315965   234441628     1062832   82  Linux swap / Solaris



Partition table entries are not in disk order

How to address this problem? Please tell me if my information is not enough. I don't know exactly what information is related to or needed to solve this problem. Leak of knowledge about this problem also makes me difficult to google it.

UPDATE

It seems this problem appeared after I tried to make 2 new ntfs partitions when another partition is in use (i.e. current Ubuntu partition). I reproduced the scenario and got this message when creating one of them:

GParted 0.11.0 --enable-libparted-dmraid



Libparted 2.3



Format /dev/sda4 as ntfs  00:00:02    ( ERROR )

    calibrate /dev/sda4  00:00:00    ( SUCCESS )

        path: /dev/sda4

        start: 52,854,784

        end: 61,239,295

        size: 8,384,512 (4.00 GiB)

    set partition type on /dev/sda4  00:00:02    ( ERROR )

    libparted messages    ( INFO )

        Error informing the kernel about modifications to partition /dev/sda3 -- Device or resource busy. This means Linux won't know about any changes you made to /dev/sda3 until you reboot -- so you shouldn't mount it or use it in any way before rebooting.

        Failed to add partition 3 (Device or resource busy)

I've rebooted, but there was no change.