Bug: Could not download all repository indexes

[BlackSir]

I've enabled Google Linux Repositories in my Ubuntu Gutsy some time
ago. It worked fine, but now every time I click 'check' in my Update
Manager there is an error message appears:
Could not download all repository indexes
The repository might be no longer available or could not be contacted
because of network problems. If available an older version of the
failed index will be used. Otherwise the repository will be ignored.
Check your network connection and the correct writing of the
repository address in the preferences.
http://dl.google.com/linux/deb/dists/stable/non-free/binary-i386/Packages.bz2:
Hash Sum mismatch

What does it actually mean and how to deal with it?

[MichaelM]

This may be something corrupt in your local index files. Try this:

sudo rm /var/lib/apt/lists/dl.google.com_linux_deb_dists_*
sudo apt-get update

If that still complains, maybe try this:

sudo apt-get -o Acquire::http::Proxy=' ' update

That should avoid using a proxy, if there is one configured on your
system. I've occasionally seen that cause problems due to stale files
in a proxy cache.

Michael

[BlackSir]

Removing of local index files completely solved the problem.
Thank you very much, MichaelM!