I have installed Lubuntu 14.04 but Flash isn't working correctly with Firefox 28.0. Viewing videos in YouTube, using the Spotify web client and yes.fm all do no work.
I can see that the addon is working fine:
shockwave flash version 22.214.171.1240
- Processor : Pentium III (Coppermine)
- Memory : 507MB (241MB used)
- Operating System : (Lubuntu 14.04 Trusty Tahr)