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If you are the first timer on UNIX-LINUX command line usage, you better consult UNIX-LINUX introductory book to master some essential UNIX commands. For example, ls (for directory listing), cp (to copy), rm (to remove a file or a directory), cd (to change directory) so on. Once you master these essential commands, you can move and swim around the vast new world, neatly organized under the root (/). Your impression would be ambivalent; very conservative and no changes for file-and-folder listing and their permission system; such as those foundations of UNIX-LINUX architecture may last for hundreds and hundreds of years to come without any change. On the other hand, you notice the newest innovations based on the UNIX-LINUX system such as wireless electro-magnetic devices Android. Ultra conservancy and new innovation co-habits in this UNIX-LINUX world. Here is one comment from a WEB-server administrator; why server administrators are fond of Fedora and CentOS from Red Hat LINUX, becuase everything you do on the GUI (Graphical User Interface), you can also run it by the command line in Terminal, furthermore there are very good user-support documentations available on Web.
Are you ready to use around the LINUX command line system in Terminal? Now TuneFind will disclose a few useful keyboard procedures (short-cuts), which can save your time and accelerate work efficienty tremendously. (One moment)
While you view YouTube video in Ubuntu such as 12.04 (Precise Pangolin), time to time, you may get the black-out phenomena, suggesting that you need to update in order to view the video. This notice may trigger the sentiment of hustle; "what should I do?". At least around later year 2014 and early year 2015, TuneFind can tell the easiest and the reliable solution. Don't do anything on Web browser and its GUI (Graphical User Interface). Completely close Web browser and get the clean Desktop screen. Then run just only the Terminal, and issue the following command line exactly as described below, then Adobe Flash Plugin will be successfully updated. After that you can get back to view the Internet video streaming again.
Debian type LINUX (only Ubuntu OS tested and worked)
$ sudo apt-get install flashplugin-installerBased on our experience, the above procedure practically makes YouTube video streaming back to work, however, you still see the black-out message. While seeing the black-out update message, only a click makes starting the video. If you don't want to see the black-out message, we recommend a perfection prodecure, updating not only Flashplugin but also Firefox browser (as described below). By doing so both then you won't see any trace of the black-out message anymore.
$ sudo apt-get install firefox
RPM type LINUX (not yet tested, excuse TuneFind)
$ su - root # yum install flash-plugin # yum install firefox
Please give TuneFind time to verify the non-tested information (3/20/2015).