There are two bugs that I currently aware of regarding the sendmail boot process. The first and simplest deals with your hostname. In Ubuntu, the default configuration of sendmail and apache required a fully qualified domain name. You can adjust your FQDN manually in the /etc/hostname file. The proper format is:
name.domain.com
Save the file, and you will not get any errors on an apache or sendmail reboot. Also there is sometimes an issue when sendmail tries to reconfigure its cf file during boot. I don’t experience this issues, but its worth mentioning due to its simple workaround. Just delete the two following files, and sendmail will not re-configure on boot (you will have to do it manually if you change its settings):
/etc/network/if-down.d/sendmail
/etc/network/if-up.d/sendmail
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As reported in my previous post, Wordpress MU has a bug where if you enable the Plugin menu, then disable it, you will not be able to re-enable it. To re-enable the Plugin menu, go into your PHPMyAdmin interface, open the database for your Wordpress MU site, open the wp_sitemeta table. Switch to the browser tab, rather than the structure tab. Locate the menu_items meta key. It should have an empty meta value, based on what I have observed, and what others are saying. Delete this meta key by hitting the red x. Now you will be able to re-enable your Plugins menu.
Note that if you re-disable the Plugin menu option, you will have to re-delete the menu_items meta key in order to re-enable it 
A quick and dirty solution to one headache of a simple problem. I expect this bug to be resolved in the next version of Wordpress MU.
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As of August 25, 2007 there is a bug in Wordpress MU where if you turn on the Plugin menu option, and then disable it, you will loose the ability to reactivate it. This bug is currently being discussed at the official Wordpress MU forums, and I believe a resolution will present itself soon.
http://mu.wordpress.org/forums/topic.php?id=5917&page#post-35846
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If you just installed Fedora Core 6, or Fedora 7, and when you boot the system the GDM (Gnome Display Manager) does not load, and your stuck at the command prompt, I recommend reinstalling the OS. You can try and start the GDM by logging in and typing:
sudo service gdm start
But most likely the simplest course of action is to do a clean install. It will work eventually, I promise
Also make especially sure that you have selected the installation of a Desktop Environment, ie. KDE, Gnome, XFCE, ect…..
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