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I recently upgraded my Toshiba Satellite P105 laptop from Ubuntu 11.04 to 12.04 (I don't have windows there). It was working fine for a couple of days, but now every time that I start the laptop, I get a black screen that says GNU Bash (it looks like the operating system command screen). I can't find the exit command to close that screen and to continue starting the regular Ubuntu. I would appreciate some help, and please write what I have to do in plain English, I am a normal person (a mechanical engineer) not a computer scientist.

Thanks in advance for you help.

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closed as too localized by Eric Carvalho, Kevin Bowen, Basharat Sialvi, Radu Rădeanu, Jorge Castro Jun 1 '13 at 14:56

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Try pressing Ctrl+Alt+F7 –  Lekensteyn May 15 '12 at 17:29
Thanks, Lekensteyn, for your feedback. And here comes my general complaint, because this combination of key strokes you gave me, should be clearly mentioned somewhere, but I spent 2 hours reading helps and couldn't find it. Anyway, I am going to reinstall 12.04, because it only partially worked, it showed about 20 lines of messages, each one saying that it was initiating some processes and daemons, but then it stopped and did nothing more. But earlier, when I started it, it went directly to my desktop and then it froze. When I restarted it, it went to the Bash, when I tried your advise. –  nargo777 May 16 '12 at 14:54
It is mentioned in the manual page of chvt(1) as the shortcut is used to change the current virtual terminal, I do not know where I learnt it myself. If a Live CD works fine, it must be an installation error, probably a bad video driver. –  Lekensteyn May 16 '12 at 15:45

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