Problem after update Ubuntu 8.04 Server software

I just update Ubuntu 8.04 Server software by command:

$ sudo apt-get update && sudo apt-get upgrade

The process it self is ok, but my apache web server can not run.

$ sudo /etc/init.d/apache2 restart

Say error in /etc/apache2/sites-enabled/000-default.save

I remove the file then apache work fine again :)

Root without password in Ubuntu

Since I use Hardy Heron, I found that we can get root console / command
prompt without a password.

I do not know, why Ubuntu team do this. But it was help me when I must
enter the admin functions but I do not know the admin user name and
password.

How to get in it?

When system is booting and prompt a GRUB menu, I press ESC key. Then I
select "Recovery mode". After the system show a selection action box, I
select "root". Than I get a sign: #