failed to fetch http://...... Hash Sum mismatch! what to do?

[shaggytwodope]

It's very important you copy these commands carefully, with the wrong folder paths you can do some harm to your system.

This will purge the old cache so to speak.

Code:

sudo rm /var/lib/apt/lists/* -vf

This will then update the caches again for the repos. Then procede to run updates as you normally would.

Code:

sudo apt-get update

If the error continues please post a your /etc/apt/sources.list file.