Preserve staging I/O failure causes (T-615)

core/installer/recovery.go

@@ -47,6 +47,12 @@ func recoverWithFence(root string, fence durabilityFence) (RecoveryResult, error
 				ErrRecoveryInconsistent,
 			)
 		}
+		if state.staging {
+			if err := removeManagedDirectoryWithFence(layout, layout.staging, fence); err != nil {
+				return RecoveryResult{}, err
+			}
+			return RecoveryResult{Action: RecoveryAborted}, nil
+		}
 		return RecoveryResult{Action: RecoveryNone}, nil
 	}