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root@NanoPi-NEO:~# sudo apt-get install -f

After this operation, 0 B of additional disk space will be used.
Setting up linux-image-4.4.0-176-generic (4.4.0-176.206) ...
Processing triggers for linux-image-4.4.0-176-generic (4.4.0-176.206) ...
/etc/kernel/postinst.d/initramfs-tools:
update-initramfs: Generating /boot/initrd.img-4.4.0-176-generic
Warning: root device  does not exist

Press Ctrl-C to abort build, or Enter to continue


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root@NanoPi-NEO:~# df -h
Filesystem      Size  Used Avail Use% Mounted on
udev             84M     0   84M   0% /dev
tmpfs            24M  4.6M   20M  20% /run
/dev/mmcblk0p2   15G  3.7G   11G  26% /
tmpfs           120M     0  120M   0% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs           120M     0  120M   0% /sys/fs/cgroup
/dev/mmcblk0p1   40M   20M   21M  49% /boot
tmpfs            24M     0   24M   0% /run/user/0
tmpfs            24M     0   24M   0% /run/user/1000


Why error appears ?