cobbler crashed with IOError in check_setup(): [Errno 5] Input/output error

On upgrade this was encountered, believe it's in a respawn loop.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: cobbler 2.1.0+git20110602-0ubuntu23
ProcVersionSignature: Ubuntu 3.0.0-9.15-generic 3.0.3
Uname: Linux 3.0.0-9-generic x86_64
NonfreeKernelModules: nvidia wl
Architecture: amd64
Date: Sat Sep 3 00:57:39 2011
ExecutablePath: /usr/bin/cobbler
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64+mac (20101218)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/cobbler profile list
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/cobbler', 'profile', 'list']
SourcePackage: cobbler
Title: cobbler crashed with IOError in check_setup(): [Errno 5] Input/output error
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

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caused by cobbler-web failing to install:

Module wsgi already enabled
ln: creating symbolic link `/usr/share/cobbler/webroot/cobbler_webui_content/Ubuntu-R.ttf': File exists
dpkg: error processing cobbler-web (--configure):
 subprocess installed post-installation script returned error exit status 1