unmet dependency of libopencv4tegra

Hello, I was updating my Jetson TK1 to L4T 21.1 and CUDA 6.5. Things went well until installing libopencv4tegra, where I get the error below. Has anyone seen this?

ubuntu@tegra-ubuntu:~/Downloads$ sudo apt-get install libopencv4tegra
[sudo] password for ubuntu:
Reading package lists… Done
Building dependency tree
Reading state information… Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
libopencv4tegra : Depends: libavcodec54 (>= 6:9.1-1) but it is not installable or
libavcodec-extra-54 (>= 6:9.16) but it is not installable
Depends: libavformat54 (>= 6:9.1-1) but it is not installable
Depends: libavutil52 (>= 6:9.1-1) but it is not installable
Depends: libswscale2 (>= 6:9.1-1) but it is not installable
E: Unable to correct problems, you have held broken packages.

The .deb(s) repos I have installed are:
cuda-repo-l4t-r21.1-6-5-prod_6.5-14_armhf.deb
libopencv4tegra-repo_l4t-r21_2.4.10.1_armhf.deb

I don’t think it’s related but when I try apt-get upgrade I see this:
ubuntu@tegra-ubuntu:~/Downloads$ sudo apt-get upgrade
Reading package lists… Done
Building dependency tree
Reading state information… Done
Calculating upgrade… Done
The following packages have been kept back:
liboxideqt-qmlplugin liboxideqtcore0 oxideqt-codecs
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.

ugh nevermind. I needed to add universe repo (saw it on elinux):
sudo apt-add-repository universe

maybe OpenCV4Tegra readme instructions could get updated. This one:
http://developer.download.nvidia.com/embedded/OpenCV/L4T_21.1/README.txt

Thanks for following up on this, SirChap. I ran into this problem as well. I second updating the instructions.