[ubuntu] wrong fs type, bad option, bad superblock

Problem : mount error

 $ sudo mount -a

mount: wrong fs type, bad option, bad superblock on Downloads,
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
# dmesg | tail

sf_read_super_aux err=-22

Solution

Need symbolic link

/sbin/mount.vboxsf -> /usr/lib/VBoxGuestAdditions/mount.vboxsf

 $ sudo ln -s /usr/lib/VBoxGuestAdditions/mount.vboxsf /sbin/mount.vboxsf

 

ref : http://qiita.com/amagitakayosi/items/07ff50afac1cd6f62c1f

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