thanks @fossfreedom it is really the problem.

However, how could I make it work with 
only-ubiquity/automatic-ubiquity/noninteractive options?
It only works if booted into live session, which is not the fact that I want. I 
need to load a preseed file for unattended installation.

How could I make it working with a preseed file?

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https://bugs.launchpad.net/bugs/1553620

Title:
  ubiquity exec needs to be prefixed with sudo to stop crash

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