To install xflip just follow these instructions.
sudo apt-get install xflip
Which will install xflip and any other packages on which it depends.
|Maintainer||Debian QA Group <firstname.lastname@example.org>|
|Description||programs to mirror-image or melt your display or horizontal axis or melt away the graphics on your display. Both commands, named xflip and meltdown, have a -planes option to independently act on individual bit planes. This version now comes with a new -oblic option which flips horizontally and vertically simultaneously.|