Questions[plugins](ubuntu)

I wrote application for linux which uses Qt5.

But when I am trying to launch it on the linux without Qt SDK installed, the output in console is:

Failed to load platform plugin "xcb". Available platforms are:

How can I fix this? Maybe I need to copy some plugin file? When I use Ubuntu with Qt5 installed, but I rename Qt directory, the same problem occurs. So, it uses some file from qt directory...

I have found file libqxcb.so in the Qt SDK directory, but placing it in /usr/lib does not help.

Previous I have never used rhythmbox by default because it seemed to be lacking in features to me. Just my personal opinion.

With rhythmbox back in 12.04 will ubuntu give it some attention to give it some usability one thing that was majorly missing on my last use of rhythmbox was an equalizer which is the most basic of requirements for an audio player let alone a preamp.

I have searched and found that on the rhythmbox website the plugin is available but in the plugins menu of rhythmbox it is not there.

I searched google and there are many guides from 2009 trying to install the equalizer. there is nothing recent and one would assume this would be a default plugin, there is no point after all searching for cover art if your music doesn't sound right.

How can I easily install the equalizer in 12.04?

How can I install the most used plugins like flash player and mp3 in Ubuntu?

The Chrome build from Google has a Chrome PDF Viewer plugin which is really nice. But, the Chromium builds don't seem to have it (nothing shows up in about:plugins).

How do I get the plugin in Chromium on Ubuntu?

It's rather frustrating to me that I can't watch any of the videos on Apple's site. Is there a QuickTime plugin for Chrome or Firefox, and if not, why?