This is happening to me too. I have a fresh 15.04 install. After a few successful reboot, I get that message every time and can't login anymore . All the alternatives are useless. My installation is encrypted. The sequence is: 1)turn on; 2) Ubuntu 15.04 screen, asking for password; 3) correct password; 4) fsckd-cancel-msg: Press control+C to cancel all filesystems checks in progress; 5) auto reboot, Grub version 2.02 beta2-22ubuntu1 screen with alternatives, all useless; 6) *Ubuntu chosen; 7) ACPI probe failed message; 8) Ubuntu 15.04 passphrase screen again 9) passphrase correct; 10) ACPI PCC probe failed message screen with cursor this time; 11) three alternatives, all useless. When I try to reboot, it says Error getting authority 12) reboot. All starts again. I think the problem is very important, because the computer is useless. Have a Sony vpcf2.
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