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    Unable to mount ext4 partition in Dolphin. Error says it busy.

    During Live Boot session of 14.04.1 after copying data and rechecking contents on my backup partition (ext4) i did unmount partition from Dolphin file manager. There were no files open.

    Now if i Boot the system again in the same Live Boot session and try to mount the same partition it shows the following error

    An error occurred while accessing 'Recovery', the system responded: The requested operation has failed: Error mounting /dev/sda4 at /media/kubuntu/Recovery: Command-line `mount -t "ext4" -o "uhelper=udisks2,nodev,nosuid" "/dev/sda4" "/media/kubuntu/Recovery"' c mount: /dev/sda4 already mounted or /media/kubuntu/Recovery busy

    What can i do to resolve this issue.

    Output of dumpe2fs is pasted below with -h option to only display the superblock information and not any of the block group descriptor detail information.

    kubuntu@kubuntu:~$ sudo dumpe2fs -h /dev/sda4
    dumpe2fs 1.42.9 (4-Feb-2014)
    Filesystem volume name: Recovery
    Last mounted on: /media/root/Recovery
    Filesystem UUID: ff662111-21b9-4cd6-8107-bcb61f0f4257
    Filesystem magic number: 0xEF53
    Filesystem revision #: 1 (dynamic)
    Filesystem features: has_journal ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
    Filesystem flags: signed_directory_hash
    Default mount options: user_xattr acl
    Filesystem state: clean
    Errors behavior: Continue
    Filesystem OS type: Linux
    Inode count: 3964928
    Block count: 15859712
    Reserved block count: 792985
    Free blocks: 2166123
    Free inodes: 3789095
    First block: 0
    Block size: 4096
    Fragment size: 4096
    Reserved GDT blocks: 1020
    Blocks per group: 32768
    Fragments per group: 32768
    Inodes per group: 8192
    Inode blocks per group: 512
    Flex block group size: 16
    Filesystem created: Sat Mar 5 17:28:28 2016
    Last mount time: Sun Mar 6 11:24:11 2016
    Last write time: Sun Mar 6 12:26:29 2016
    Mount count: 9
    Maximum mount count: -1
    Last checked: Sat Mar 5 17:28:52 2016
    Check interval: 0 (<none>)
    Lifetime writes: 53 GB
    Reserved blocks uid: 0 (user root)
    Reserved blocks gid: 0 (group root)
    First inode: 11
    Inode size: 256
    Required extra isize: 28
    Desired extra isize: 28
    Journal inode: 8
    Default directory hash: half_md4
    Directory Hash Seed: d5ed119f-0f78-4106-b434-8bd5b5328d99
    Journal backup: inode blocks
    Journal features: (none)
    Journal size: 128M
    Journal length: 32768
    Journal sequence: 0x0000046c
    Journal start: 0

    kubuntu@kubuntu:~$

    #2
    Resolved this issue By installing GParted in Live Session and executing Check Partition. Gparted showed following command in execution log

    e2fsck -f -y -v -C 0 /dev/sda4

    If executing this command from Terminal command would be - sudo e2fsck -f -y -v -C 0 /dev/sda4 where sda4 is desired device

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