Nfs server not responding, hanging startup after 10.10.3 update

Question

The system boots up fine and I enter my password, then it sits for over 6 minutes with a spinning wheel. The console shows:
4/16/15 10:35:30.000 AM kernel[0]: nfs server localhost:/zz0Lo64HS_Mb5IMJ_JdkXi: not responding
4/16/15 10:35:34.214 AM netbiosd[232]: name servers down?
4/16/15 10:36:01.000 AM kernel[0]: nfs server localhost:/zz0Lo64HS_Mb5IMJ_JdkXi: not responding
4/16/15 10:36:22.000 AM kernel[0]: nfs server localhost:/zz0Lo64HS_Mb5IMJ_JdkXi: dead
4/16/15 10:37:33.515 AM apsd[77]: Reporting com.apple.main-thread is hung
4/16/15 10:41:48.000 AM kernel[0]: nfs reconnect localhost:/zz0Lo64HS_Mb5IMJ_JdkXi: returned 4
4/16/15 10:41:48.557 AM KernelEventAgent[96]: tid 54485244 received event(s) VQ_DEAD (32)
4/16/15 10:41:48.557 AM KernelEventAgent[96]: tid 54485244 type 'mtmfs', mounted on '/Volumes/MobileBackups', from 'localhost:/zz0Lo64HS_Mb5IMJ_JdkXi', dead
4/16/15 10:41:48.558 AM KernelEventAgent[96]: tid 54485244 force unmount localhost:/zz0Lo64HS_Mb5IMJ_JdkXi from /Volumes/MobileBackups
4/16/15 10:41:48.559 AM KernelEventAgent[96]: tid 54485244 found 1 filesystem(s) with problem(s)
After this the system then carries on like normal.  I'm not sure where MobileBackups came from, seems to be a corrupt file somewhere. How do I fix this?

Answer 1

Triple-click anywhere in the line below on this page to select it:
/Library/Keychains
Right-click or control-click the line and select
          Services ▹ Reveal in Finder (or just Reveal)
from the contextual menu.* A folder should open with a subfolder named "Keychains" selected.
Open the Info window. In the General section at the top, is the box marked Locked checked?
Close the Info window. Inside the Keychains folder, there should be a file named exactly "apsd.keychain". Is that file present? Are there any files with a name such as "apsd.keychain.something"?
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combination  command-C. In the Finder, select
          Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You won't see what you pasted because a line break is included. Press return.