Can't follow install prompts

[gold_finger]

That's strange.  It should be present.  Maybe you typed in command slightly wrong.  Try again but use mouse to copy/paste command into the terminal to make sure it's exactly as I typed it.

If for some reason it still shows not present, run this command to see if slideshow program shows up under a different name.

Code:

dpkg -l | grep 'slideshow'

It should be "ubiquity-slideshow-xxxx" (xxxx's being either "ubuntu" or something else) and the line it's on should start with an "ii" (which means it is installed on the live environment).  If you don't see that, post back with the output of the command for us to see.