As you may have seen, some of my blog posts contain screenshots from within Raspbian. Here's how I've taken those screenshots.
A Raspberry Pi Blog By Steve-J
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Taking Screenshots
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Updating The Operating System and Installing Programs
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One of the things you should do when you first connect your Raspberry Pi to the internet is to run a system update to get the latest version of all the programs running on your Pi.
Programs in Raspbian are made up of a number of packages, updates to these packages are controlled by the Advanced Package Tool.