After several attempts, I researched a lot and managed to take a step to solve my problem, ubunto server 14.04 / EasyEngine v3.7.4
root@ubuntu:~# sudo su
root@ubuntu:~# wp cli update --allow-root
root@ubuntu:~# ee update
root@ubuntu:~# ee stack purge
root@ubuntu:~# ee stack install
I'm working with the following system versions, the above solution worked for me.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.5 LTS
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