aptitude does not start - symbol lookup error

[Paul White]

Each time I try to start aptitude I see the following:

paul@N7110:~> sudo aptitude
[sudo] password for paul:
aptitude: symbol lookup error: aptitude: undefined symbol: _ZNK13Configuration10FindVectorB5cxx11EPKc

Seen on two similarly configured PC since last update. This error makes aptitude unusable.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: aptitude 0.7-1ubuntu1.1
ProcVersionSignature: Ubuntu 4.2.0-14.16-generic 4.2.2
Uname: Linux 4.2.0-14-generic x86_64
ApportVersion: 2.19-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Oct 5 22:42:24 2015
InstallationDate: Installed on 2015-07-17 (80 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150717)
SourcePackage: aptitude
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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

[matsonfamily (david-matsonfamily)]

same thing on 2 15.10 (XFCE and a cli-only) environments. Libept is libept1.4.16 v 1.0.13ubuntu1. is libept just missing the symbol?

[Michael Vogt (mvo)]

Sorry for this temporary hickup, please upgrade apt/libapt-pkg4.16 and aptitude to the current version in wily and the problem should be fixed.

[Robin Kanters (r-kanters)]

Can confirm that upgrading those packages fixed the problem! Thanks for the quick solution!