unable to mount New Volume or unable to access location from Ubuntu

There might be some problem in your ntfs partition. You can fix it using  

ntfsfix                                       

Open terminal and type

  sudo ntfsfix /dev/sda2                                            

After successful completion of command try to remount the portition.


Are you install windows and ubunthu Dualboot 
 
You need to disable Windows fast start-up option.

Open Control Panel -> Energy Settings and select Change what the power buttons do.

Choose Change settings that are currently unavailable, scroll down and uncheck
Turn on fast start-up (recommended).

Restart the computer and you won't have this error anymore.

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