Installer crashed when free software installed with manual partitioning

ubuntu kernel: [ 613.225510] plugininstall.p[11223]: segfault at 7f0da78cbbf0 ip 00007f0db0b3569d sp 00007fff113b9780 error 6 in libapt-pkg.so.4.12.0[7f0db0aa4000+11b000]

occurred during free software installation with manual partitioning

Press F6 and use the down arrow to get to Free software only and press Enter after the language selection screen.

One partition with ext4 mounted on /, swap and another ext4 mounted on /boot

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: ubiquity 2.12.12
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
ApportVersion: 2.6.1-0ubuntu3
Architecture: amd64
CasperVersion: 1.328
Date: Mon Oct 15 20:27:44 2012
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper only-ubiquity initrd=/casper/initrd.lz quiet splash -- apt-setup/restricted=false apt-setup/multiverse=false
LiveMediaBuild: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121015.2)
ProcEnviron:
 LANGUAGE=en_GB.UTF-8
 TERM=linux
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)