Islam Hassan's questions

In previous versions of Ubuntu, I was installing and using Arista Transcoder seamlessly with no problems at all. After upgrading to Ubuntu 14.04 and installing Arista, whenever I try to transcode any video, the following error message appears

Python2.7-minimal requires an additional plugin for this operation.
The following plugin is required:
GStreamer element ffdeinterlance
Do you want to search for this now?

When I press "Search", the following error message appears:

Cannot add conversion to queue because of missing elements!

Any idea how to solve this problem?

I've uploaded some files to Ubuntu One from my home laptop and begin to download it on my work laptop. Then I've got a USB and copied these files directly through the USB driver. My problem now is that Ubuntu One still downloading these files although I've copied them to Ubuntu One folder. I need it to consider the already existing files as synced and don't download it again. And I need Ubuntu One for further use so I can't simply quit it. How could I mark the already existing files as synced ?

I've Ubuntu 12.04 installed.

I've added guake to startup applications but it doesn't work. All programs listed in startup application are working except guake. What should I do?

My network includes machines running Linux and others running Windows. And my machine is running Linux.