update-apt-xapian-index crashed with SystemError in open(): E:Malformed line 56 in source list /etc/apt/sources.list (dist parse), E:The list of sources could not be read., E:The package lists or status file could not be parsed or opened.

[zeruke]

happened when trying to open software-center

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: apt-xapian-index 0.44ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-8.11-generic 3.0.1
Uname: Linux 3.0.0-8-generic x86_64
NonfreeKernelModules: nvidia wl
Architecture: amd64
Date: Tue Aug 16 19:32:40 2011
ExecutablePath: /usr/sbin/update-apt-xapian-index
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110808)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/sbin/update-apt-xapian-index --update -q
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.UTF-8
 PATH=(custom, no user)
PythonArgs: ['/usr/sbin/update-apt-xapian-index', '--update', '-q']
SourcePackage: apt-xapian-index
Title: update-apt-xapian-index crashed with SystemError in open(): E:Malformed line 56 in source list /etc/apt/sources.list (dist parse), E:The list of sources could not be read., E:The package lists or status file could not be parsed or opened.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #721797, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.