F-spot has been removed from Ubuntu Vivid (15.04).

http://www.ubuntuupdates.org/package/core/utopic/universe/base/f-spot

Dependency is not satisfiable: liblcms1 (>= 1.15-1)

None of the data for f-spot was gone, just the ability to run the application – probably something to do with mono library deprecation.

~$ find / -name f-spot 2>/dev/null
/home/g/.gconf/apps/f-spot
/home/g/.config/f-spot

1.3MB in /home/g/.config/f-spot/photos.db

Anyway, opened Shotwell, “Import from Application”, “Import media from: F-Spot”, moving on.