I'm running ubuntu 12.04 and I'm trying to replace my compiled from source octave3.6.2 by the already compiled 3.6.3 made available in the Mike Miller's repository.
After having uninstalled 3.6.2,
$ sudo apt-get install octave leads to the error message error: feval: function `unimplemented' not found
and an useless octave prompt:
octave:1> ls error: feval: function `unimplemented' not found
I checked my .octaverc and following the bug report (691311) I checked my liboctave1 version that is 3.6.3 which should work with octave3.6.3.