Being my first post in here, I'm sorry to barge in on the thread but digiKam is a
must-have application for me so I followed your instructions to the letter. After executing digiKam from the menu, I got the bouncing mouse pointer for a while and then nothing. So, I executed
digkam from a terminal and it was telling me it couldn't find
libexiv2.so.5. After executing
ldconfig from a root terminal, it still couldn't find it and I couldn't find it either as it's not on my system. After installing
exiv2-0.18.2-i486-1as.tgz from the Slack repos, digiKam is now happy. To add full functionality to digiKam I had to install
kipi-plugins-0.1.7-i486-1sl.tgz from the Slack repos. Hope this is of some use to the OP and others

Regards from the UK