I already installed newer version of ubuntu therefore now i can use octave 3.0 and use instruction as appeared in manual still with the error messages
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octave:1> I = loadimage ("lena.bmp"); error: load: /home/unimap/lena.bmp: inconsistent number of columns near line 2 error: load: unable to extract matrix size from file `/home/unimap/lena.bmp'
error: evaluating assignment _expression_ near line 47, column 8 error: called from `loadimage' in file `/usr/share/octave/3.0.0/m/image/loadimage.m' error: evaluating assignment _expression_ near line 1, column 3
octave:1>