Here is a list of tutorials about Linux in general, with some about security in linux. I found these links in one of the Facebook Groups.

I hope that you’ll like them and if anyone needs me to make a tutorial for something particular, please don’t hesitate to ask.

1). Installing Ubuntu Using VirtualMachine

http://www.youtube.com/watch?v=ZdTfWWYA-bc )

2). Introducing Ubuntu 11.10

http://www.youtube.com/watch?v=HT8pcBl1EIk )

3). Compiz in Ubuntu 11.10 & 10.10

http://www.youtube.com/watch?v=LwTqzPbuf7k )

http://www.youtube.com/watch?v=KQcwmRmH9-k )

4). Blocking Ports in Linux using IP Tables

http://www.youtube.com/watch?v=1hq1EuRlqX0 )

5). Beginner guide.

How to install applications using Ubuntu Software Center and the Terminal

http://www.youtube.com/watch?v=-nlbKIn_0HY )

6). Using CHKROOTKIT and RKHUNTER to detect Rootkits ( Basic Overview )

http://www.youtube.com/watch?v=ydL847SrMWE)

7). Using BeEF to Hook Browser & how to protect yourself from XSS attacks

http://www.youtube.com/watch?v=Sj5_GuIVzso )

8). Learning about, configuring and compiling a kernel.

http://www.learninglinuxkernel.com/ )

9). How to Cyanogenmod 7 on Samsung GSII Using Ubuntu 11.10

http://www.youtube.com/watch?v=e9JoSRBu49o )

10). How to root Samsung GSII using Ubuntu 11.10

http://www.youtube.com/watch?v=MHlNVmCIPWI )

11). Control your Android using VNC

http://www.youtube.com/watch?v=wJQuJlRbAtc )

12). How to configure WakeOnLan in Linux-Ubuntu

http://www.youtube.com/watch?v=pcJJt90Nkgc )

13). SMT Management Series.

How to Static IP using Terminal

http://www.youtube.com/watch?v=wmO4iG8-zHU )

14). SMT Management Series.

Introduction to NTOP ( Traffic Analysis )

http://www.youtube.com/watch?v=BBD77XtV2Zk )

15). SMT Management Series.

Encrypt your files with ENCFS

https://www.youtube.com/watch?v=zfXDc4GRKAE )

16). SMT Management Series.

Linux File Server with Samba 

http://www.youtube.com/watch?v=08UsuqPi448 )

17). SMT Management Series.

Backup server with Clonezilla as Image

http://www.youtube.com/watch?v=JCWCTAoonWg )

18). SMT Management Series.

Creating Virtual Machines in a headless machine (VBoxHeadless)

http://www.youtube.com/watch?v=amKi2lw4woA )

* Please note that the videos about Android are for educational purposes only.