sudo apt-get install gnome-raw-thumbnailer ufraw-batch
Try now if everything works, and your thumbnails show up. If not, try the following part.
The git command-line utility has plenty of inconsistencies http://steveko.wordpress.com/2012/02/24/10-things-i-hate-about-git/
A GUI like http://sourcetreeapp.com is often helpful, but staying on the command line usually quicker. This is a list of the commands I use most frequently, listed by functional category:
git status list which (unstaged) files have changed
rsync (Everyone seems to like -z, but it is much slower for me)
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