Hi,
I had the same error on a fresh Ubuntu 16.04 installation when trying to form an interferogram with the most recent version of SNAP (5.0.4).
(org.esa.snap.core.gpf.OperatorException: Interferogram: org.jblas.NativeBlas.dgemm(CCIIID[DII[DIID[DII)V)
It turned out that a library was missing. After installing the packet “libgfortran3” Interferogram formation runs fine.
@developers: Could you include checking for this dependency in the installer script?
Thanks,
Lukas