1. apt-get install mysql-server mysql-client apache2
2. apt-get install sendmail
3. download bugzilla-4.4.tar.gz
4. tar xvzf bugzilla-4.4.tar.gz
5. mv bugzilla-4.4 /usr/local
6. ln -s /usr/local/bugzilla-4.4 /var/www
7. ./checksetup.pl --check-modules
8. perl install-module.pl --all
9. ./checksetup.pl
10. vi localconfig to modify $webservergroup, $db_user, and $db_pass
11. vi /etc/apache2/envvars to modify APACHE_RUN_USER and APACHE_RUN_GROUP if need
12. vi /etc/mysql/my.cnf to add allowed attachment size
13. vi /etc/apache2/apache2.conf to add section [1]
14. vi /var/www/bugzilla/data/params # modify urlbase

[1] :
<Directory /var/www/bugzilla>
AddHandler cgi-script .cgi
AddHandler cgi-script .pl
Options +ExecCGI
DirectoryIndex index.cgi index.html
AllowOverride Limit FileInfo Indexes Options
</Directory>