Converter comandos do CentOS para o Ubuntu

Question

Eu encontrei um script do CentOS que eu quero rodar, mas eu preciso reescrever todos os comandos para que ele funcione com o Ubuntu. Alguém poderia me ajudar?

    #!/usr/bin/perl

print "Install packages? [Y/n]\n";
chomp($req=<STDIN>);
if(lc ($req) eq "y" || $req eq ""){
    print "Packages Install...\n";
    sleep(2);   
    system("yum install httpd mod_ssl");
    system("/sbin/chkconfig httpd on");
    system("yum install php-mysql php-devel php-gd php-pecl-memcache php-pspell php-snmp php-xmlrpc php-xml");
    system("/usr/sbin/apachectl restart");
    system("yum install make");
    system("yum install gcc");
        system("yum install perl");
    print "\nL'Installation OK !\n";
}

print "SSH2 Install? [Y/n]\n";
chomp($ssh=<STDIN>);
if(lc ($ssh) eq "y" || $ssh eq ""){
    print "SSH2 Installation...\n";
    sleep(2);   
    system("yum install php php-pear libssh2 libssh2-devel");
    system("pecl install -f ssh2");
    system("touch /etc/php.d/ssh2.ini");
    system("echo extension=ssh2.so > /etc/php.d/ssh2.ini");
    system("/etc/init.d/httpd restart");
    print "\nVerification...\n";
    system("php -m | grep ssh2");
    print "If you see ssh2, it works!\n";
}

print "Compile scripts? [Y/n]\n";
chomp($scripts=<STDIN>);

if(lc ($scripts) eq "y" || $scripts eq ""){
    print "Compilation ...\n";
    sleep(2);
    system("yum -y install screen libpcap-devel tcl tcl-devel gcc");
    system("mv /root/api.php /var/www/html/");
    system("sh /root/sedip.sh");
        system("sh /root/sedpass.sh");
    print "\nGo to http://YOURVPSIPADDRESS/flood.php\n";    
    print "Your VPS IP Address is: ";
    system("wget -q -O - http://ip.tupeux.com | tail");   
    sleep(2);
    system("rm -rf /root/sedip.sh");
    system("rm -rf /root/sedpass.sh");
    sleep(2);
    print "\nFinished !\n";
}