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Description of problem: Trying to start a scan via nmap one gets the following error message "OS scan requested but I cannot find nmap-os-db file. It should be in /usr/local/share/nmap, ~/.nmap/ or . QUITTING!" Version-Release number of selected component (if applicable): 5.51-1.fc16
Do you really have original nmap package from fedora? We use /usr/share/nmap instead of /usr/local/share/nmap. Also I tried to reproduce this and it's working for me without any problem. Try to reinstall nmap package "yum reinstall nmap". What command line options did you use?
BS"D Yes sure, I did yum erase -y nmap nmap-frontend as root and installed them from new. Maybeit was some old binary from the original version which I had left under /usr/local/bin since the fedora package does not install anything under /usr/local/share/. Now I cleaned /usr/local/ up and reinstalled the packages ... and it works. So blame it all on me. Sorry for bothering.