Generation of the Sewers fails with Lua errors

[peridot]

While running crawl, I get the following messages:

$ crawl
Lua error: /usr/share/crawl/dat/des/sprint/sprint_mu.des:11: Can't find "clua/sprint.lua"
Lua error: /usr/share/crawl/dat/des/tutorial/tutorial_lesson2.des:6: Can't find "clua/tutorial.lua"
Lua error: /usr/share/crawl/dat/des/portals/ziggurat.des:8: Can't find "clua/ziggurat.lua"
Unable to generate level for 'Sewer'!

The first three appear every time I run crawl and have no obvious negative effects. But when I advanced a character sufficiently to reach the Sewer portal level, specifically when I entered the portal, I received a large number of error messages about an inability to generate "megabat"s, and the game exited. The same occurs when I attempt to resume the saved game.

Perhaps there is some version mismatch between the lua and the compiled code?

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: crawl 2:0.9.1-1
ProcVersionSignature: Ubuntu 3.2.0-23.31-lowlatency 3.2.14
Uname: Linux 3.2.0-23-lowlatency x86_64
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
Date: Thu Jun 21 13:54:26 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
 LANGUAGE=en
 TERM=xterm-256color
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: crawl
UpgradeStatus: Upgraded to precise on 2012-04-27 (54 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.