I've installed okular using synaptic on my lapper. I try to open a pdf typing "okular filename.pdf" and I get the following error:
A Fatal Error Occurred
The application Okular (okular) crashed and caused the signal 6 (SIGABRT).
Please help us improve the software you use by filing a report at http://bugs.kde.org
. Useful details include how to reproduce the error, documents that were loaded, etc.