Every time I am try to install Adobe Flash plug-in via Ubuntu Software center, I get the error message:
Package dependencies cannot be resolved
I tried various commands in the terminal but I couldn't fix the problem.
Try this. Just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command below.
And then try installing again.
If the above doesn't help, you can always install Adobe flash using:
Source:Install Adobe Flash
Sounds like a repository mismatch. I've been dealing with broken packages and dependencies ever since the last Ubuntu upgrade, last night.
Which repository location are you using?
I had mine set for a mirror in Brazil (which is close to where I live). Only after I switched back to the Main repo stuff got back to normal.