In auto mode, failed steps were not triggering 'die' because tee was eating the return code

install_yunohost

@@ -191,7 +191,10 @@ function apt_get_wrapper() {
           --                                           \
           apt-get $*
     else
-        apt-get $* 2>&1 | tee -a $YUNOHOST_LOG
+        # Why we need pipefail : https://stackoverflow.com/a/6872163
+        set -o pipefail
+        apt-get $* 2>&1 | tee -a $YUNOHOST_LOG || return 1
+        set +o pipefail
     fi
 }