update-apt-xapian-index crashed with Couldn't open /var/cache/apt-xapian-index/index.2/postlist.baseB in __init__(): No such file or directory

[PiAnto]

Binary package hint: apt-xapian-index

Fresh install of Ubuntu 11.04, updated on recommended repos.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: apt-xapian-index 0.41ubuntu6
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
Date: Thu May 5 16:28:49 2011
ExecutablePath: /usr/sbin/update-apt-xapian-index
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110413)
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=it_IT.UTF-8
 LANGUAGE=it_IT:en
 SHELL=/bin/bash
PythonArgs: ['/usr/sbin/update-apt-xapian-index', '--update', '-q']
SourcePackage: apt-xapian-index
Title: update-apt-xapian-index crashed with Couldn't open /var/cache/apt-xapian-index/index.2/postlist.baseB in __init__(): No such file or directory
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: