Linux solve the mount disk partition's problem , Error opening directory: Permission denied

 Error opening directory: Permission denied

if you mount a disk partition. and can't access the data.

the computer shows the error message: Error opening directory: permission denied

here is the solution 

if your partition's path is media/user-name/your-partition-name

using the command in terminal:

sudo chmod g+rw /media/user-name/your-partition-name