Checklist for WordPress “Pretty Permalinks” on Ubuntu

1. Enable mod_rewrite
cd /etc/apache2/mods-enabled
sudo ln -s ../mods-available/rewrite.load rewrite.load
2. Change to AllowOverride All in userdir
sudo vim userdir.conf
   Example of my userdir.conf:
   <Directory /dir/to/wordpress>
AllowOverride All
Options MultiViews Indexes SymLinksIfOwnerMatch IncludesNoExec
</directory>
3. Customize Permalink Structure in WordPress admin page
4. Copy .htaccess in WordPress directory if not created.
   cd /dir/to/wordpress
sudo vim .htaccess
   Should be something linke this:
   <IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /wordpress/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /wordpress/index.php [L]
</IfModule>