
To resolve this, you have to disable FileVault on your main partition, which is named "Macintosh HD" by default, and reboot afterwards. But when things have changed, and your main partition is encrypted, the bootup process can not get to this data as it has no access to your main partition, which is only unlocked after you enter your password. User names and user pictures are normally stored there too, so they can be shown on the login screen. Your Mac boots from a small (always unencrypted) partition, which will show the login screen.
MACBOOK PRO SOFTWARE UPDATE YOSEMITE SOFTWARE
Some people think the "" message has to do with a pending software update, but that's not the case. It's the first version of OS X where this is the default. During the installation of OS X Yosemite, you can choose if you want to enable FileVault, and it's turned on by default. You can find this setting in System Preferences -> Security & Privacy -> FileVault. Is FileVault (full disk encryption) enabled for your main disk? Because it was in my case, and it proved to be the cause of this error. When I did it for my main boot disk (but befrore I booted the carbon copy cloned volume I also keep mounted) the login window showed my accounts again, but still listed the entry, presumably because the boot shim on the unencrypted partion still didn't have credentials for all the bootable encrypted disks attached to the system. Once done for all bootable disks attached to the system the entry on login window was gone for good.

Before decrypting - look in FileVault pref pane and see if there is an error about "not all accounts can decrypt this disk"Ĭlicking this let me supply pw's for the accounts.
