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Here is the error I got while trying to install octave:

$ sudo add-apt-repository ppa:octave/stable
$ sudo apt-get update
$ sudo apt-get install octave
The following packages have unmet dependencies:
 octave : Depends: libarpack2 (>= 2.1) but it is not going to be installed
          Depends: libcholmod2.1.2 but it is not going to be installed
          Depends: liboctave3 (= 4.0.2-1ubuntu5~octave~trusty1) but it is not going to be installed
          Recommends: default-jre-headless but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

I have tried many ways to install octave, but they have failed.

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