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Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
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Possible Starting Point #1: Alt-F2 to bring up a run dialog so you can open a terminal window in which you can run xrandr to change the screen resolution
Possible Starting Point #2: Alt-F2 to bring up a run dialog so you can run system-config-display as suggested by sem007)
Possible Starting Point #3: Ctl-Alt-F1 or Ctl-Alt-F2 (one of these should get you a text console) at which point you can become root and:
1. "telinit 3" to kill X and switch to text mode
2. login as root
3. "Xorg -configure" to create xorg.conf.new which you can edit to use the desired resolution
4. copy xorg.conf.new to /etc/X11/xorg.conf
5. "telinit 5" (or reboot)