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i'm currently installing ROS groovy onto Rpi, and had the same issue. It was related to my outdated printout of the instructions. Double check the install instructions. they've been update a few times in the last few days.

python-rospkg is related to installing python-pip and/or python-gtk2 back in step 2 "Install the core dependencies". To fix python-rospkg (plus others) I ...
sudo apt-get install python-pip python-gtk2
sudo apt-get update
sudo apt-get upgrade (to be sure, to be sure, to be sure)
this removed 8 of the 12 depenicies listed in rosdep check. the remaining 4, I removed manually from the package.xml files.
And all was good in the land of catkin...

On a side note: catkin_make_isolated takes 24-36 hours to run, most of the time is cmake'ing PCL.
Also a 8GB sd card isn't big enough. 16gb is working for far.
Hope this helps.