Connection to Vyatta vRouter v5600

Hi All,
I begin in Ansible.
First test: 3 VM on my PC: 2 vrouters and one Ubuntu VM, all in the same subnet.
All ping are ok, Telnet and SSH well configured, and well connected.
When i initiate an "ad HOC " command to realize a “show version” from Ubuntu to VR1 (with module RAW) , i receive an error, as followed:
Thanks for your help,
David

dsa@ubuntu:~$ ssh david@R1
Welcome to Brocade Network OS

david@r1’s password:
Welcome to Brocade Network OS
Version: 5.2R2
Description: Brocade Network OS 5600 5.2R2 Standard
Built on: Tue Nov 29 22:52:37 UTC 2016
Last login: Fri Feb 2 12:57:58 2018 from 172.2.2.1
david@VR1:~$ exit
logout
Connection to r1 closed.

dsa@ubuntu:~$
dsa@ubuntu:~$ ansible R1 -m raw -a “show version” -u david -k
[DEPRECATION WARNING]: [defaults]hostfile option, The key is misleading as it
can also be a list of hosts, a directory or a list of paths . This feature will
be removed in version 2.8. Deprecation warnings can be disabled by setting
deprecation_warnings=False in ansible.cfg.
SSH password:
R1 | FAILED | rc=127 >>
vbash: show: command not found
Welcome to Brocade Network OS

Shared connection to r1 closed.
non-zero return code

dsa@ubuntu:~$ .