[SOLVED] - Hash Sum mismatch, Ubuntu 14.04

If you have been repeatedly getting the following errors when trying to update Ubuntu, and have perhaps the simple solution I tried my help you.

>> Error:

 W: Failed to fetch http://np.archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/binary-amd64/Packages Hash Sum mismatch  
 W: Failed to fetch http://np.archive.ubuntu.com/ubuntu/dists/trusty-updates/main/binary-amd64/Packages Hash Sum mismatch  
 W: Failed to fetch http://np.archive.ubuntu.com/ubuntu/dists/trusty-updates/universe/binary-i386/Packages Hash Sum mismatch  
 E: Some index files failed to download. They have been ignored, or old ones used instead.  

All the solution mentioned here didn't work for me:

• https://goo.gl/zKWv9g
• https://goo.gl/4uV3mf

>> Solution: Finally this simple solution worked for me:

1. Open your Unity Dash and type 'Software & Updates' and select it.

2.  Try with various mirrors available from the 'Download from' list. You can start with Main Server and if that doesn't work out other mirrors.

This approach worked for me, try it, might work for you as well.