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Up to now I have used Microsoft Windows. I am a beginner with Unix generally and with Ubuntu 12.04 particularly. I have got advices to try the system by a command 'Firefox' and then to install a developers tool by a command 'sudo apt-get install gcc'. I have tried to write the command directly to the Ubuntu desktop window; a command line appeared, I have written the command 'Firefox' (without apostrophe characters and pressed Enter key), but it starts no action, though the Firefox browser starts well from an icon left at the desktop window of the newly installed Ubuntu.
I see, that about 'sudo apt-get install gcc' with Ubuntu 12.04 problems do exist and are discussed at the http://askubuntu.com . I have written the command 'sudo apt-get install gcc' to the Ubuntu desktop window, too; the system requested my password and made an icon 'Update manager'. I have installed all 211 updates, but the 'Firefox' nor the other command does not work and the 'Update manager' icon disappeared. My Canon MG5150 USB printer does not print as a 'generic printer' from the installation.
Evidently I need first beginner's manuals how to work with the Ubuntu 12.04 (pressing F1 does nothing) and what are base commands of Unix. And also how to work with the Firefox browser; I have guessed how to set a bookmark but I do not see how to call it. And also how to make FTP connections and how to transfer files to the Windows XP and from it by a net or by an USB flash. Please advise me which manuals, thanks, Tomas Peceny