Seems you have Ubuntu 9.10 Karmic with a "10.04 Lucid" repository added.
Is that right ?
Not really usable for installing any system packages.
When the issues have been fixed, you will be able to install packages again.
Opencv too, of course. They just have some odd naming :
9.10 karmic : libcv-dev libcv1 libcvaux-dev libcvaux1
libhighgui-dev libhighgui1 opencv-doc python-opencv
10.04 lucid : libcv-dev libcv4 libcvaux-dev libcvaux4
libhighgui-dev libhighgui4 opencv-doc python-opencv