Re: Can't install flash on Ubuntu 8.04
At this point I'd say that there's something wacky going on with your package management system. So bypass the package manager, and install the plugin from the .tar.gz at Adobe.com.
It's pretty much a "drag this file into your /usr/lib/mozilla/plugins directory" sort of install.
I try to treat the cause, not the symptom. I avoid the terminal in instructions, unless it's easier or necessary. My instructions will work within the Ubuntu system, instead of breaking or subverting it. Those are the three guarantees to the helpee.