Yep I saw there was a systemctl service :
root@galileo:/dev/cpu# systemctl list-unit-files *sshd*
UNIT FILE STATE
But I have to clue how to enable it :
root@galileo:/dev/cpu# systemctl enable sshd@
The unit files have no [Install] section. They are not meant to be enabled
Possible reasons for having this kind of units are:
1) A unit may be statically enabled by being symlinked from another unit's
.wants/ or .requires/ directory.
2) A unit's purpose may be to act as a helper for some other unit which has
a requirement dependency on it.
3) A unit may be started when needed via activation (socket, path, timer,
D-Bus, udev, scripted systemctl call, ...).
I don't know systemctl... maybe that's why
You don't need to do anything. The ssh daemon is started by default and runs on the standard port. You should be able to "ssh root@yourgalileoaddress" and get busy.