Unmet dependencies with unstable-desktop-full, Natty

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Hi! I try to install ros-unstable-desktop-full on Natty 11.04, but I have next problem:

~$ sudo apt-get install ros-unstable-desktop-full
...
The following packages have unmet dependencies:
 ros-unstable-desktop-full : Depends: ros-unstable-vision-opencv (= 1.6.1-s1313731650~natty) but it is not going to be installed
                             Depends: ros-unstable-image-pipeline (= 1.5.2-s1313739013~natty) but it is not going to be installed
                             Depends: ros-unstable-image-transport-plugins (= 1.4.1-s1313731752~natty) but it is not going to be installed
E: Broken packages
~$ sudo apt-get install ros-unstable-vision-opencv
...
The following packages have unmet dependencies:
 ros-unstable-vision-opencv : Depends: libopencv2.3-dev (= 2.3.1+svn6514+branch23-1~natty) but it is not going to be installed
E: Broken packages

There was ros-electric previously, but I removed it completely. How can I fix this problem? Thanks in advance!