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inodes are not set appropriately to take into account later partition growth. The root filesystem should be formatted will enough inodes based on the assumption it will be grown later.
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4K device sector are not presently handled. This means disk images will not work optimally on physical/VM/cloud machines that provide a storage device with 4K logical sector sizes, indeed for UEFI machines they will likely not boot as the ESP partition will not be sized appropriately (the minimal FAT filesystem size for 4K sector devices is larger than for 512-byte sector devices). In the future the script will add an option to specify sector size and will take this into account when partitioning the disk image, installing the bootloader and formatting any LUKS filesystem.
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encrypted disk images when dd'ed onto disks will have known passphrase/key and volume key. The planned bootable image installer utility will reencrypt disk images (in ramdisk) before dd'ing them to the destination device so that each time the same disk image is installed its volume key will be unique.