From experience: try another USB-cable.

Hi Magnus,
Yes, I tried with 2 m and 25 cm cables, both working in the mint machine, but no connection shows in the ubuntu netbook

Can you connect with the GPhoto Driver?

Yes, I have tested in the two machines, and gphoto2 is working in both of them:
Abilities for camera             : Canon EOS 1100D                             
Serial port support              : no
USB support                      : yes
Capture choices                  :
                                 : Image
                                 : Preview
                                 : Trigger Capture
Configuration support            : yes
Delete selected files on camera  : yes
Delete all files on camera       : no
File preview (thumbnail) support : yes
File upload support              : yes

I can take pictures and previews with gphoto, but still not connection through ekos in the ubuntu netbook.

Is there any other log or test I can try?
Thanks for the help.