add --allow-downgrades for apt-get

lib/functions/rootfs/apt-install.sh

@@ -103,7 +103,7 @@ function install_deb_chroot() {
 	declare -g if_error_detail_message="Installation of $install_target failed ${BOARD} ${RELEASE} ${BUILD_DESKTOP} ${LINUXFAMILY}"
 	declare -a extra_apt_envs=()
 	extra_apt_envs+=("ARMBIAN_IMAGE_BUILD_BOOTFS_TYPE=${BOOTFS_TYPE:-"unset"}")                             # used by package postinst scripts to bevahe
-	DONT_MAINTAIN_APT_CACHE="yes" chroot_sdcard_apt_get --no-install-recommends install "${install_target}" # don't auto-maintain apt cache when installing from packages.
+	DONT_MAINTAIN_APT_CACHE="yes" chroot_sdcard_apt_get --allow-downgrades --no-install-recommends install "${install_target}" # don't auto-maintain apt cache when installing from packages.
 	unset extra_apt_envs
 
 	# IMPORTANT! Do not use short-circuit above as last statement in a function, since it determines the result of the function.