mount: wrong fs type, bad option, bad superblock

mount: wrong fs type, bad option, bad superblock on 125.64.41.244:/data/img,
       missing codepage or helper program, or other error
       (for several filesystems (e.g. nfs, cifs) you might
       need a /sbin/mount.<type> helper program)
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

apt-get install nfs-common

或者

yum install nfs-utils

sudo umount /mnt/

/mnt was not found in /proc/mounts

/mnt was not found in /proc/mounts

解决：

umount 时使用 -l 命令。

$ sudo umount -l /mnt/