Translations by Мирослав Николић

Then type:

# <cmd>reboot</cmd>

After you successfully log in, you will not be able to access your keyring (since you don't remember the old password). This means that all your saved passwords for wireless networks, jabber accounts, etc. will no longer be accessible. You will need to <link xref="#delete-keyring">delete the old keyring</link> and start a new one.

Reset password using a Live CD or USB

Boot the Live CD or USB.

Mount your drive.

Press <keyseq><key>Alt</key><key>F2</key></keyseq> to get the <gui>Run Application</gui> window.

Type <cmd>gksu nautilus</cmd> to launch the file manager with system-wide privileges.

Within the drive you just mounted, you can check that it is the right drive by clicking <gui> home </gui> and then your username.

Go to the top-level directory of the mounted drive. Then go into the <gui>etc</gui> directory.

Locate the 'shadow' file and make a backup copy:

Right-click on the shadow file and select <gui>copy</gui>.

Then right-click in the empty space and select <gui>paste</gui>.

<link xref="files-rename">Rename</link> the backup "shadow.bak".

Edit the original "shadow" file with a text editor.

Find your username for which you have forgotten the password. It should look something like this (the characters after the colon will be different):

Delete the characters after the first colon and before the second colon. This will remove the password for the account.

Save the file, exit out of everything and reboot your computer without the live CD or USB.

When you boot back into your installation, click your name in the menu bar. Open <gui>My Account</gui> and reset your password.

For <gui>Current password</gui> do not enter anything, as your current password is blank. Just click <gui>Authenticate</gui> and enter a new password.

Get rid of the keyring

This will delete all your saved passwords for wireless networks, instant messaging accounts, etc. Only do this if you can't remember the password you used for your keyring.

Press <keyseq><key>Ctrl</key><key>h</key></keyseq> (or click <guiseq><gui>View</gui><gui>Show Hidden Files</gui></guiseq>.)

Double click on the folder called keyrings.

Delete any files you find in the keyrings folder.

Restart the computer.

After you restart and log in you will be asked to enter your wireless networks password.

Use longer, more complicated passwords.

Choose a secure password

Make your passwords easy enough for you to remember, but very difficult for others (including computer programs) to guess.

Choosing a good password will help to keep your computer safe. If your password is easy to guess, someone may figure it out and gain access to your personal information.

People could even use computers to systematically try to guess your password, so even one that would be difficult for a human to guess might be extremely easy for a computer program to crack. Here are some tips for choosing a good password:

Make your password as long as possible. The more characters it contains, the longer it should take for a person or computer to guess it.

Do not use any words that appear in a standard dictionary in any language. Password crackers will try these first. The most common password is "password" -- people can guess passwords like this very quickly!

Do not use any nouns.

Use different passwords for different things.

Use different passwords for different accounts.

If you use the same password for all of your accounts, anyone who guesses it will be able to access all of your accounts immediately.

Change your passwords regularly.

You might not have the right codecs installed, or the DVD might be the wrong region.

Why won't DVDs play?

If you insert a DVD into your computer and it doesn't play, you may not have the right DVD <em>codecs</em> installed, or the DVD might be from a different <em>region</em>.

Installing the right codecs for DVD playback

In order to play DVDs, you need to have the right <em>codecs</em> installed. A codec is a piece of software that allows applications to read a video or audio format. If you try to play a DVD and don't have the right codecs installed, the Movie Player should tell you about this and offer to install them for you.

DVDs are also <em>copy-protected</em> using a system called CSS. This prevents you from copying DVDs, but it also prevents you from playing them unless you have <link xref="video-dvd-restricted">extra software</link> to handle the copy protection.

Checking the DVD region

DVDs have a <em>region code</em>, which tells you in which region of the world they are allowed to be played. If the region of your computer's DVD player doesn't match the region of the DVD you are trying to play, you won't be able to play the DVD. For example, if you have a Region 1 DVD player, you will only be allowed to play DVDs from North America.

It is often possible to change the region used by your DVD player, but it can only be done a few times before it locks into one region permanently. To change the DVD region of your computer's DVD player, use <link href="apt:regionset">regionset</link>.

Most commercial DVDs are encrypted and will not play without decryption software.

How do I enable restricted codecs to play DVDs?