I found that one of my partition in windows was missing in Ubuntu, so I tried to mount it back. Firstly type:
$ sudo fdisk -l
to check what are partitions available. And I figured out that sda4 is the partition missing, so I tried
$ sudo mkdir /media/e
But it gave me:
Mount is denied because the NTFS volume is already exclusively opened.
Maybe it’s because auto-mount performed by Ubuntu somehow grab the handle, so I unmounted this partition first and mounted it back by:
$ sudo umount -l /dev/sda4