The installation is failing. I have not seen the detailed code. But it looks that manifest is not asking for username.
31103 DEBUG + args_array=([u]=username= [h]=home_dir= [s]=use_shell)
31103 DEBUG + declare -Ar args_array
31104 DEBUG + local username
31104 WARNING /usr/share/yunohost/helpers.d/user: line 67: username: unbound variable
31104 DEBUG + local home_dir
31105 WARNING !!
31105 DEBUG + local use_shell
31105 WARNING libreerp's script has encountered an error. Its execution was cancelled.
31105 DEBUG + ynh_handle_getopts_args libreerp /var/www/libreerp
31106 WARNING !!
31106 DEBUG + set +x
31107 WARNING
31107 DEBUG ! Helper used in legacy mode !
31107 DEBUG + use_shell=/var/www/libreerp
31108 DEBUG + home_dir=libreerp
31108 DEBUG ++ ynh_exit_properly
31108 DEBUG ++ local exit_code=1
31109 DEBUG ++ '[' 1 -eq 0 ']'
31109 DEBUG ++ trap '' EXIT