Pbuilder broken due to aptitude: symbol lookup error

[Andreas Tille <andreas@an3as.eu>]

Hi,

I'm using testing (just upgraded) and noticed that pbuilder fails to
resolve Build-Depends.  For all packages I try I get:

...
(Reading database ... 12078 files and directories currently installed.)
Preparing to unpack .../pbuilder-satisfydepends-dummy.deb ...
Unpacking pbuilder-satisfydepends-dummy (0.invalid.0) ...
dpkg: pbuilder-satisfydepends-dummy: dependency problems, but configuring anyway as you requested:
 pbuilder-satisfydepends-dummy depends on debhelper (>= 9); however:
  Package debhelper is not installed.

Setting up pbuilder-satisfydepends-dummy (0.invalid.0) ...
aptitude: symbol lookup error: aptitude: undefined symbol: _ZN7cwidget7widgets5pager8set_textERKSsPKc
E: pbuilder-satisfydepends failed.
...


This is for a package that only Build-Depends debhelper.  Other packages
with more Build-Dependencies are failing to install any of them.

Any hint?

Kind regards

       Andreas.

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