update-manager crashed with SIGSEGV in PkgDepCacheMarkedInstall()

Refreshed repositories and attempted upgrade after receiving "W: Failed to fetch gzip:/var/lib/apt/lists/partial/us.archive.ubuntu.com_ubuntu_dists_precise_main_i18n_Translation-en Encountered a section with no Package: header
"

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.7
ProcVersionSignature: Ubuntu 3.2.0-18.28-generic-pae 3.2.9
Uname: Linux 3.2.0-18-generic-pae i686
ApportVersion: 1.94-0ubuntu1
Architecture: i386
Date: Tue Mar 6 11:22:33 2012
ExecutablePath: /usr/bin/update-manager
GsettingsChanges:
 com.ubuntu.update-manager first-run false
 com.ubuntu.update-manager launch-time 1331025772
 com.ubuntu.update-manager show-details true
 com.ubuntu.update-manager window-height 500
 com.ubuntu.update-manager window-width 600
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20120201.1)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/update-manager
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0xb5c7b965: cmpw $0x202,0x16(%eax)
 PC (0xb5c7b965) ok
 source "$0x202" ok
 destination "0x16(%eax)" (0x08f4f95a) not located in a known VMA region (needed writable region)!
SegvReason: writing unknown VMA
Signal: 11
SourcePackage: update-manager
StacktraceTop:
 ?? () from /usr/lib/python2.7/dist-packages/apt_pkg.so
 PyEval_EvalFrameEx ()
 PyEval_EvalCodeEx ()
 ?? ()
 ?? ()
Title: update-manager crashed with SIGSEGV in PyEval_EvalFrameEx()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo