Hi @Kwignaman @pierreh @yusf @procraste ,
The installation seems to be OK on Raspi 2 & Raspi 3.
The metronome problem persist on Raspi 1 et 1B+.
I’ve made an experimental tutorial here : http://avignu.wiki.tuxfamily.org/doku.php?id=documentation:yunohost-jessie from Installation de Yunohost 2.4 sur raspbian jessie minimal sur un Raspberry Pi 3.
And @heyyounow have made an image for Raspi here : https://mega.nz/#!ik1lgbDJ!tR21crUmfDvIP5J3Y5eyZFd9eCovfCQhp-NsfW42r0A from New updated Raspberry Pi image / Nouvelle image Raspberry Pi.
Hope it could helps you and sorry for my froggy english 
ppr