Browsing Arabic translation

40.

Click the <application>User Switcher</application> in the top right of the panel and then press <guibutton>Lock screen</guibutton>.

41.

Press <keycombo><keycap>Control</keycap><keycap>Alt</keycap><keycap>L</keycap></keycombo> to lock the screen. This keyboard shortcut can be changed in <menuchoice><guimenu>System</guimenu><guimenuitem>Preferences</guimenuitem><guimenuitem>Keyboard Shortcuts</guimenuitem></menuchoice>.

42.

You can add a <guibutton>Lock Screen</guibutton> button to a panel for easy access. Right-click a panel (for example, the panel at the top of the screen), select <guibutton>Add to Panel...</guibutton> and drag the <guibutton>Lock Screen</guibutton> item to the desired location.

43.

To unlock the screen, move the mouse or press a key. Then, type your password and either press the <keycap>Enter</keycap> key or press the <guibutton>Unlock</guibutton> button.

44.

If more than one person has a user account on your computer and the screen is locked, other users can press the <guibutton>Switch user...</guibutton> button to use the computer, even while the screen is locked. They will be unable to access your currently-open work, and you will be able to switch back to your locked session when they have finished using the computer.

45.

Set up a firewall

46.

You may wish to install a firewall to protect your computer against unauthorized access by people on the Internet or your network. Firewalls block connections to your computer from unknown sources, which helps to prevent security breaches. If you use a router to connect to the Internet, the router may already have a firewall configured which regulates connections from the Internet to your network. This section deals with setting up a firewall on Ubuntu to regulate connections to your computer.

47.

Firewall configuration tools

48.

<application>Uncomplicated Firewall (UFW)</application> is the standard firewall configuration program in Ubuntu. It is a command line program. Most users will prefer to use <application>Gufw</application>, which is a graphical program to configure <application>UFW</application>.

49.

Advanced users may wish to use <application>UFW</application> directly in the terminal. See the <ulink type="help" url="man:ufw">UFW manual</ulink> or the <ulink url="https://help.ubuntu.com/community/UFW">Community Documentation page on <application>UFW</application></ulink> for more information. Alternatively, you can use <application>iptables</application> - see the <ulink type="help" url="man:iptables">iptables manual</ulink>.