Readynas duo v1 apt-get fails retieving packages list

Could

Hi all.

I have a Readynas duo v1 on firmware 4.1.16 (last one) and I have installed ssh access and apt-get command.

But I have an issue installing new packages (like php).

When I do an apt-get update (or install XXX) I have an error telling me packages list has moved :

~# apt-get update
Err http://www.readynas.com 4.1.16/ Packages
  301 Moved Permanently [IP: 99.86.89.68 80]
Ign http://www.readynas.com 4.1.16/ Release
Hit http://archive.debian.org sarge/main Packages
Hit http://archive.debian.org sarge/main Release
Hit http://archive.debian.org sarge/contrib Packages
Hit http://archive.debian.org sarge/contrib Release
Hit http://archive.debian.org sarge/non-free Packages
Hit http://archive.debian.org sarge/non-free Release
Failed to fetch http://www.readynas.com/packages/4.1.16/Packages.gz  301 Moved Permanently [IP: 99.86.89.68 80]
Reading Package Lists... Done
W: Couldn't stat source package list http://www.readynas.com 4.1.16/ Packages (/var/lib/apt/lists/www.readynas.com_packages_4.1.16_Packages) - stat (2 No such file or directory)
W: Couldn't stat source package list http://www.readynas.com 4.1.16/ Packages (/var/lib/apt/lists/www.readynas.com_packages_4.1.16_Packages) - stat (2 No such file or directory)
W: You may want to run apt-get update to correct these problems
E: Some index files failed to download, they have been ignored, or old ones used instead.

Could someone helps me ? I found nothing on the internet (niether elsewhere in the all universe ;))

Thanks a lot.