- remove grub's --verbose, it's really too verbose
- trust in TMPDIR, do not use trap at all in compile_plymouth-theme-armbian - settings traps adhoc is forbidden in armbian-next as well
- be more verbose in umount_chroot(), do not try to unmount tmpfs-mounted dir itself, only xx/tmp
- try to be smarter about /tmp being mounted in rootfs-to-image -- in the end the recursive saves us
- run post_debootstrap_tweaks when the SDCARD is still mounted, not after
- don't try to download anything from any mirrors if SKIP_ARMBIAN_REPO==yes
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