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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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hi and welcome.
A Security-Enhanced Linux Primer
Security-Enhanced Linux (SELinux) was developed by the U.S. National Security
Agency to provide a level of mandatory access control. It goes beyond the
discretionary access control associated with file permission and ACLs. In essence,
SELinux limits the damage if there is a security breach. For example, if the system
account associated with an FTP service is compromised, SELinux makes it more
difficult to use that account to compromise other services.
( copied from RHCSA-RHCE redhat linux [chapter 4] )
"I'm using a p4 machine and I want run ubuntu in it, can you help me as to get it done?
I have 1Gb ram in my machine."
That may be OK if you don't do too much. Ubuntu may have to be changed for maybe lubuntu or xubuntu or a different distro. Your old box may or may not seem fast enough with ubuntu. That has nothing to do however with SElinux. Many distro's have the ability to add in or enable easily SElinux.
As John said, SEL is a Fedora/CentOS thing, unless you want the trouble of installing it yourself. Similar is Aparmour, which comes with Ubuntu and its derivatives and also with OpenSUSE. Sometimes SEL can be too much of a good thing: Samsung say their printers won't run unless you switch it off and that's certainly true for me. Aparmour is less difficult.
Your computer is similar to the one I'm using, and I had to use some fancy tricks to get Ubuntu to boot: it doesn't care for older computers. If you haven't installed yet, I'd suggest Linux Mint (the Mate version), which will be fine.