I really thought I had this figured out. I tried to do an "Update All" from Nito TV, and it tells me "No space left on device". Last time I had this problem (there's a post here about it), I was able to SSH into the Apple TV and do a "apt-get clean" which freed up space. However, I've done that, and no luck.
And since there's no space left, I can't even uninstall some things (I have Plex, XBMC, and a few others installed).
Help anyone? What is sfe to delete, via command line, to free up space?