Yep, the server is up to date :
root@box:~# yunohost tools upgrade --system
Info: Nothing to do! Everything is already up to date!
Info: Upgrading packages…
Success! The system has been upgraded
And :
root@box:~# apt-get install --no-install-recommends docker-ce
Reading package lists... Done
Building dependency tree
Reading state information... Done
docker-ce is already the newest version (5:19.03.6~3-0~raspbian-stretch).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] Y
Setting up docker-ce (5:19.03.6~3-0~raspbian-stretch) ...
Job for docker.service failed because the control process exited with error code.
See "systemctl status docker.service" and "journalctl -xe" for details.
invoke-rc.d: initscript docker, action "start" failed.
● docker.service - Docker Application Container Engine
Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
Active: activating (auto-restart) (Result: exit-code) since Mon 2020-02-17 13:25:48 GMT; 42ms ago
Docs: https://docs.docker.com
Process: 27757 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock (code=exited, status=1/FAILURE)
Main PID: 27757 (code=exited, status=1/FAILURE)
CPU: 1.047s
Feb 17 13:25:48 box.sucha.fr systemd[1]: docker.service: Unit entered failed state.
Feb 17 13:25:48 box.sucha.fr systemd[1]: docker.service: Failed with result 'exit-code'.
dpkg: error processing package docker-ce (--configure):
subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
docker-ce
E: Sub-process /usr/bin/dpkg returned an error code (1)
Thanks again