Apt-get update error in VyOS-1.1.6 (Debian 6.0.10 - Squeeze)

I's trying to install some packages on my VyOS (1.1.6 image) and got 404 errors with "apt-get update":

Err http://ftp.us.debian.org squeeze/main Sources  404  Not Found [IP: 128.30.2.26 80]Err http://ftp.us.debian.org squeeze/contrib Sources  404  Not Found [IP: 128.30.2.26 80]Err http://ftp.us.debian.org squeeze/non-free Sources  404  Not Found [IP: 128.30.2.26 80]Err http://ftp.us.debian.org squeeze/main amd64 Packages  404  Not Found [IP: 128.30.2.26 80]Err http://ftp.us.debian.org squeeze/contrib amd64 Packages  404  Not Found [IP: 128.30.2.26 80]Err http://ftp.us.debian.org squeeze/non-free amd64 Packages  404  Not Found [IP: 128.30.2.26 80]W: Failed to fetch http://ftp.us.debian.org/debian/dists/squeeze/main/source/Sources.gz  404  Not Found [IP: 128.30.2.26 80]
W: Failed to fetch http://ftp.us.debian.org/debian/dists/squeeze/contrib/source/Sources.gz  404  Not Found [IP: 128.30.2.26 80]
W: Failed to fetch http://ftp.us.debian.org/debian/dists/squeeze/non-free/source/Sources.gz  404  Not Found [IP: 128.30.2.26 80]
W: Failed to fetch http://ftp.us.debian.org/debian/dists/squeeze/main/binary-amd64/Packages.gz  404  Not Found [IP: 128.30.2.26 80]
W: Failed to fetch http://ftp.us.debian.org/debian/dists/squeeze/contrib/binary-amd64/Packages.gz  404  Not Found [IP: 128.30.2.26 80]
W: Failed to fetch http://ftp.us.debian.org/debian/dists/squeeze/non-free/binary-amd64/Packages.gz  404  Not Found [IP: 128.30.2.26 80]

Then I realized that Debian Squeeze had reached its EOL. So, to be able to install packages I have to:

1. Add the following line to /etc/apt/sources.list file:

deb http://archive.debian.org/debian/ squeeze main non-free contrib

2. Comment out all other lines & save

3. Run "sudo apt-get update"

4. Install the packages that I want.


Reference: http://unix.stackexchange.com/questions/310726/how-to-update-debian-6-0-squeeze-at-current-moment