erroe Installing Debian DNS-320L

[Николай Р.]

Hello.

Forgive my English, I use google translate

I installed the firmware.

Used raid0 for my disks.

Installed the package  xz 

And try to install Debian 

Getting an error

==================================================

Downloading installer...

--2017-04-01 11:09:46--  http://ftp.ru.debian.org/debian/pool/main/c/cdebootstrap/cdebootstrap-static_0.7.7_armel.deb
Resolving ftp.ru.debian.org... 85.143.112.112
Connecting to ftp.ru.debian.org|85.143.112.112|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 339642 (332K) [application/octet-stream]
Saving to: 'cdebootstrap-static_0.7.7_armel.deb'

     0K ................ ................ .........       100% 1.38M=0.2s

2017-04-01 11:09:57 (1.38 MB/s) - 'cdebootstrap-static_0.7.7_armel.deb' saved [339642/339642]

Extracting installer...

Downloading and installing Debian, this might take some time...

I: Can't find keyring debian-archive-keyring.gpg
P: Retrieving Release
P: Retrieving Release.gpg
W: Couldn't validate Release!
P: Parsing Release
P: Retrieving Packages.xz
P: Validating Packages.xz
sh: sha256sum: not found
P: Retrieving Packages.gz
P: Validating Packages.gz
sh: sha256sum: not found
E: Couldn't download Packages!

An error has occurred, cleaning up.

=========================================================

please, help

[Rolf Pedersen]

Maybe this helps: https://groups.google.com/forum/#!topic/alt-f/Ua2Lb_-DsGk
also:  https://groups.google.com/forum/#!topic/alt-f/ceIFDsTbWx0
Rolf