apt_purge_unneeded_packages_and_clean_apt_caches()
du
- 'lock' might or not be there, tolerate 1 file (not 0)
helios64
PACKAGE_LIST_BOARD_REMOVE
artifact_input_variables
KEEP_ORIGINAL_OS_RELEASE=yes
/etc/os-release
KERNEL_CONFIGURE=yes
is_boot_dev_vfat()