You have to edit /etc/apt/soures.list and uncomment the line with "sid" in it. Then Code: apt-get update apt-get install calibre apt-get clean Thereafter you should not forget of putting the "#" back. Btw, the central picture with flipping book covers is also there in version 0.7.7, when you click the appropriate button in the lower right. The general outlay has however changed. And, yes, version numbers are not like decimal numbers.
apt-get update apt-get install calibre apt-get clean