Packages are available both in source form and compiled for AMD64 arch.
They should work for Debian sid and Ubuntu Gutsy at least (and perhaps Feisty)
Put the following lines in /etc/apt/sources.list.d/swfdec.list
deb http://www.leroutier.net/floss/apt/ unstable main universe
deb-src http://www.leroutier.net/floss/apt/ unstable main universe
Changes you'll find in this release :
- Based on upstream 0.5.3
- Use /etc/alternatives/ for flash plugin
- Integrate with Ubufox (automatic plugin install)
- Full clean-up of debian/ dir (things you don't want to know)