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thank you for the answer, this gave me reason to search more.

I found now, that it works, but just if it used without the "prefix". that means, if i use it without the prefix, then works (or the prefix must be a subfolder of the temp).
Making a subfolder of the LyX files is not enough, the ...

Did someone manage to use tikzexternalize on Ubuntu? I'm using ubuntu 13.10 and texlive 2013 , and it still doesn't work.
Tried all the options and steps from all kind of forums, but in the end in the subfolder where the image should be created, a log file is created with the error message:

! I ...

Any plans to bring lyx to ubuntu touch? Since LyX is based on QT, it might be quite easy, to compile lyx for ubuntu touch?
Any experiments done in this direction?