Sorry for the Kodi version, I was confuse with the 15.2 release. 
How can I be sure that OSMC is well upgraded ? Because after the freeze during the package install… I can’t go back on this screen…
- I didn’t get a notification of system being upgraded (Following this : Run script after update? and this was working before)
- I refer to the following issue, @sam_nazarko said that it will be fixed on this release, but it still happens to me…
So I think my system is not well updated.
Yes I’ve made some little modification during my Sonarr installation.
I followed that guide : Install Sonarr Raspberry Pi with Mono 3.10 •
So libmono is on hold, to be sure this system will still work.
And a source modification (just an add) to get Sonarr update :
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys FDA5DFFC
echo "deb https://apt.sonarr.tv/ master main" | sudo tee -a /etc/apt/sources.list