Another option is to try imagemagick convert utility,Imagemagic can be easily installed using software center or synaptic.

Since the document is scanned it should be a bitmap which imagemagick can handle, only the version of the .cdr would be a concern, you did not mention the version of the cdr file so you may just try imagemagick, at your terminal in the directory where the .cdr file is located, run the convert utility like this;

convert image.cdr image.png

this will convert the .cdr image called image.cdr to a .png image called image.png file that you can easily use, probably vectorize by tracing in inkscape if you wish.

See the imagemagic documentation on the convert utility if more control over the output is needed. hope the output is satisfactory.

There's a lot of .pcb tools in Ubuntu that you can use to see that file:

Leon

Leon Heller

G1HSM

Kicad - looks pretty good, info here

sudo apt-get install kicad

gEDA

EAGLE from CADSOFT

Altium

Instalation for Altium (Wine is required)

sudo add-apt-repository ppa:ubuntu-wine/ppa

sudo apt-get update

sudo apt-get install wine1.5

wine1.5 is beta version, if you want stable choose wine1.4

After Wine is installed, download Altium and install it normally, like you woould on windows.

Altium Designer 10 is reported working in WineHq.

Circad demo