Ubuntu: 16.04 issues after kernel upgrade


I upgraded my Ubuntu 16.04 to 16.04.2 and also did a kernel upgrade to Kernel 4.8. Since then Ubuntu asks me to enter the passphrase for the encrypted HDD, though it isn't encrypted (passphrase is an empty string). Another issue is that I can shutdown Ubuntu with the command sudo poweroff -f. Without sudo or -f Option it doesn't work. How can I fix these issues?

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