I always skip Adobe Flash installation, and Reader, because I use Chrome for most browsing, and it has Adobe Flash built-in, as well as the ability to display PDF docs too.
I do not care for Adobe's stuff wanting to run all the time, and I periodically see their stuff getting used as an entry point for malicious code once in a while.
So - I normally go into settings and set the default app for opening PDF files to be Google Chrome, and also never have issues with Flash media playing in Chrome without my having to deal with separate installation and maintenance of Flash.
Bob Bone