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replace the /dev/blabla to the uuid in /etc/fstab
you can find the uuid by typing blkid

then
make an ssh key rename the public key to authorized_keys and copy it to /etc/dropper/initramfs

I had the same problem, you have to change the nick name /dev/blablabla to the real name meaning the uuid in the file /etc/fstab


# <file system> <mount point> <type> <options> <dump> ...