Bug#867006: Acknowledgement (aptitude crashes with Uncaught exception: ../../src/ui.cc:1548: void auto_fix_broken(): Assertion "resman->resolver_exists()" failed.)

[Thadeu Lima de Souza Cascardo]

As an additional data point, the same issue happens when I try to
upgrade texinfo packages (info, install-info, texinfo). I mark them for
upgrade, then press g, and the incorrect assertion aborts aptitude. :-)

Cascardo.