Debian / Ubuntu Linux: E: Encountered a section with no Package: header Error and Solution

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I‘m running the apt-get update command to fetch updates but getting the following errors:

Get:1 squeeze/updates Release.gpg [836 B]
Ign squeeze/updates/contrib Translation-en
Ign squeeze/updates/contrib Translation-en_IN
Ign squeeze/updates/main Translation-en
Ign squeeze/updates/main Translation-en_IN
Ign squeeze/updates/non-free Translation-en
Ign squeeze/updates/non-free Translation-en_IN
Get:2 squeeze/updates Release [86.9 kB]
Get:3 squeeze/updates/main Sources [89.5 kB]
Get:4 squeeze/updates/contrib Sources [765 B]
Get:5 squeeze/updates/non-free Sources [20 B]
Get:6 squeeze/updates/main amd64 Packages [273 kB]
Get:7 squeeze/updates/contrib amd64 Packages [620 B]
Get:8 squeeze/updates/non-free amd64 Packages [20 B]
Hit squeeze Release.gpg
Ign squeeze/contrib Translation-en
Ign squeeze/contrib Translation-en_IN
Ign squeeze/main Translation-en
Ign squeeze/main Translation-en_IN
Ign squeeze/non-free Translation-en
Ign squeeze/non-free Translation-en_IN
Hit squeeze Release
Hit squeeze/main Sources
Hit squeeze/non-free Sources
Hit squeeze/contrib Sources
Hit squeeze/main amd64 Packages
Hit squeeze/non-free amd64 Packages
Hit squeeze/contrib amd64 Packages
Fetched 451 kB in 12s (36.5 kB/s)
Reading package lists… Error!
E: Encountered a section with no Package: header
E: Problem with MergeList /var/lib/apt/lists/security.debian.org_dists_squeeze_updates_contrib_i18n_Translation-en
E: The package lists or status file could not be parsed or opened.

How do I fix this problem under Debian or Ubuntu Linux operating systems?

Debian Linux (Squeeze) Install Firefox 4

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My Debian Linux 6 (64 bit) has Epiphany installed which is the GNOME web browser. Epiphany aims to be simple to use and standards compliant but I want all other Firefox extensions. How do I install the latest version of Firefox 4 under Debian Linux version 6?