If I hover over to the setting menu or any of the indicator menus,
Prnt Scrnbutton won't work.
If I want to take the snapshot of these menus, how do I do that?
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Try the Screenshot application included with 12.04
Open the Dash and type screenshot
With this application you can set a delay, by adjusting the value in the "Grab after a delay of" box, before it will automatically take a screenshot allowing you to open the menu you want a picture of.
A less mechanical method to print a pop-up menu. This software have a dedicated option to do that.
I recommend you this software with more options that facilitates your work. Also, with this app you can capture:
This has a daemon to take screen-shots more quickly and easily:
Also have a built-in image editor to customize the photo just taken.
By default it has 3 seconds of delay, to disable go to Edit then Preferences and set the delay value to 0.
Install the application Sutter, then select the area you want to take the screenshot of and apply the delay in which you will be able to reach that indicator, like I did for my blog