Error mounting: mount exited with exit code 13
Solution 1:
You can start from your Windows CD into recovery mode to perform tasks such as chkdsk. If you have no access to an installation CD you can also download a Recovery CD image.
Solution 2:
In this case it's worth checking your NTFS drive first:
- Install ntfsfix
- Then from terminal run the following,
sudo ntfsfix /dev/sda2