-grep trusty /etc/apt/sources.list && \
- echo "deb http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse" >> /etc/apt/sources.list
-
+if grep -q trusty /etc/apt/sources.list ; then
+ if [ "${YARD_IMG_ARCH}" = "arm64" ]; then
+ echo "deb [arch=${YARD_IMG_ARCH}] http://ports.ubuntu.com/ trusty-backports main restricted universe multiverse" >> /etc/apt/sources.list
+ else
+ echo "deb http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse" >> /etc/apt/sources.list
+ fi
+fi