When I check for updates, I get a “Failed To Download Repository Information” error.
This is what comes up under details:
W: Failed to fetch gzip:/var/lib/apt/lists/partial/us.archive.ubuntu.com_ubuntu_dists_natty_main_source_Sources Hash Sum mismatch,
E: Some index files failed to download. They have been ignored, or old ones used instead.
Just remove the content of /var/lib/apt/lists directory:
sudo rm -fR /var/lib/apt/lists/*
sudo apt-get update