update-apt-xapian-index crashed with DatabaseError in buildIndex(): Modifications failed (DatabaseOpeningError: Couldn't open base /var/cache/apt-xapian-index/index.3/spelling.baseA to write: No such file or directory), and cannot set consistent table revision numbers: Couldn't reread base A

[Per-Inge]

Happened on a fresh installed daily build 21/7, just updated from the main server.
Synaptic and "lightdm-example-gtk-greeter" crashed at the same time.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: apt-xapian-index 0.43ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-6.7-generic 3.0.0-rc7
Uname: Linux 3.0.0-6-generic x86_64
Architecture: amd64
Date: Sun Jul 24 08:18:07 2011
ExecutablePath: /usr/sbin/update-apt-xapian-index
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110721)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/sbin/update-apt-xapian-index --update -q
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/sbin/update-apt-xapian-index', '--update', '-q']
SourcePackage: apt-xapian-index
Title: update-apt-xapian-index crashed with DatabaseError in buildIndex(): Modifications failed (DatabaseOpeningError: Couldn't open base /var/cache/apt-xapian-index/index.3/spelling.baseA to write: No such file or directory), and cannot set consistent table revision numbers: Couldn't reread base A
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: