Ffsync won't install

My YunoHost server

Hardware: Raspberry Pi 2 at home
YunoHost version: 11.0.10.2 (stable)
I have access to my server : Through SSH, webadmin and phisical
Are you in a special context or did you perform some particular tweaking on your YunoHost instance ? : no

Description of my issue

Tried to install ffsync in order to rely on my own server for browser synchronization.

Installation script fails with the following log

https://paste.yunohost.org/raw/codazowalu

I already had some issue with resources on my server, so I already tried to switch off a bunch of services, with no success, but still this could be the problem.

I already checked the following thread, but it doesn’t seem the same issue…

Thanks in advance for the kind help,
e.