These instructions were written for a '''fresh install''' of Ubuntu(Hoary). I used the Ubuntu [http://www.ubuntulinux.org/support/documentation/faq/installation-custom/view?searchterm=server%20install Custom install] which creates a very bare-bones system - no X server or other niceties. Just the ticket for a lightweight, nimble server!

These instructions should work OK under other conditions (full install, existing systems) as well.

FYI, Trac has trouble with Ubuntu's {{{WartyWarthog}}} release; it needs versions of python-SQLite and clearsilver that aren't available on Warty (see #468 & #1104). So I upgraded my fresh Warty install to the {{{HoaryHedgehog}}} release. A fresh Hoary install should be ok but I didn't test that.

To upgrade from Warty to Hoary, I changed my '''/etc/apt/sources.list''' to look like this:
{{{
## Main & restricted
deb http://archive.ubuntu.com/ubuntu hoary main restricted
deb-src http://archive.ubuntu.com/ubuntu hoary main restricted

## Universe (needed for the Trac install)
deb http://archive.ubuntu.com/ubuntu hoary universe
deb-src http://archive.ubuntu.com/ubuntu hoary universe

## Security
deb http://security.ubuntu.com/ubuntu hoary-security main restricted
deb-src http://security.ubuntu.com/ubuntu hoary-security main restricted
}}}

... then ran the following commands to actually perform the update: 
{{{
sudo apt-get update 
sudo apt-get -y upgrade
}}}

You can take a nice long break while Hoary is downloaded and installed. 

Once that's done, we have a brand-new Hoary install. The rest of these instructions look painful, but really the hardest part is now over. With a fast net connection, you can do the rest of this in 10-15 minutes.

We need to install a few more things:

{{{
sudo apt-get install trac
sudo apt-get install libapache2-svn
}}}

'''NOTE:''' You should also do an '''apt-get install python''' before installing '''trac'''.  Apparently, apt-get failed to install python properly and cause some errors on in the later commands.  The only caveat here is that '''apt-get install python''' will uninstall '''gde''' so beware!!!  Do an '''apt-get install gde''' to restore the desktop... if you installed the desktop, that is. Also, take a look near the end of this file for how the original author solved the python issue without doing this. Could be that python changed in the Hoary repository?

----
NOTE: Throughout the rest of this text I use {{{YourProjectNameHere}}} as the project name. Clearly, you'll want to replace this with a name for your own project!
----

Configure Apache for by editing '''/etc/apache2/sites-available/default'''. When you're done the file will look like this (I think my changes are pretty obvious - they are preceded by the comment lines IN ALL CAPS):
{{{
NameVirtualHost *
<VirtualHost *>
        ServerAdmin webmaster@localhost

        DocumentRoot /var/www/
        <Directory />
                Options FollowSymLinks
                AllowOverride None
        </Directory>
        <Directory /var/www/>
                Options Indexes FollowSymLinks MultiViews
                AllowOverride None
                Order allow,deny
                allow from all
                # This directive allows us to have apache2's default start page
                # in /apache2-default/, but still have / go to the right place
                # Commented out for Ubuntu
                #RedirectMatch ^/$ /apache2-default/
        </Directory>

## ---THESE LINES FROM ORIGINAL FILE WERE COMMENTED OUT---
#       ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
#       <Directory "/usr/lib/cgi-bin">
#               AllowOverride None
#               Options ExecCGI -MultiViews +SymLinksIfOwnerMatch
#               Order allow,deny
#               Allow from all
#       </Directory>
## ---END OF COMMENTS---

        ErrorLog /var/log/apache2/error.log

        # Possible values include: debug, info, notice, warn, error, crit,
        # alert, emerg.
        LogLevel warn

        CustomLog /var/log/apache2/access.log combined
        ServerSignature On

    Alias /doc/ "/usr/share/doc/"
    <Directory "/usr/share/doc/">
        Options Indexes MultiViews FollowSymLinks
        AllowOverride None
        Order deny,allow
        Deny from all
        Allow from 127.0.0.0/255.0.0.0 ::1/128
    </Directory>

## ---THESE LINES WERE ADDED TO THE ORIGINAL FILE---
Alias /trac "/usr/share/trac/htdocs"
ScriptAlias /cgi-bin/ /usr/share/trac/cgi-bin/
<Location "/cgi-bin/trac.cgi">
 SetEnv TRAC_ENV "/var/trac/YourProjectNameHere"
</Location>

<Directory "/usr/share/trac/htdocs">
  Options Indexes MultiViews
  AllowOverride None
  Order allow,deny
  Allow from all
</Directory>

# You need something like this to authenticate users
<Location "/cgi-bin/trac.cgi/login">
  AuthType Basic
  AuthName "YourProjectNameHere"
  AuthUserFile /var/www/trac.htpasswd
  Require valid-user
</Location>

#SVN dir
<Location /svn>
  DAV svn
  SVNParentPath /var/svn
</Location>
## ---END OF ADDITIONS---

</VirtualHost>

}}}

Alternatively, instead of making a mess of your nice default vhost, why not take advantage of the vhost setup that unbuntu kindly has already set up for you.

Make a new file called /etc/apache2/sites-available/trac and put this in it.
{{{
<VirtualHost *>
        ServerAdmin webmaster@localhost
        ServerName trac.example.com
        DocumentRoot /usr/share/trac/cgi-bin/
        <Directory /usr/share/trac/cgi-bin/>
                Options Indexes FollowSymLinks MultiViews ExecCGI
                AllowOverride All
                Order allow,deny
                allow from all
        </Directory>
        Alias /trac "/usr/share/trac/htdocs"
        <Location /trac.cgi>
            # You may need to customize this
            SetEnv TRAC_ENV "/var/trac"
        </Location>

        DirectoryIndex trac.cgi
        ErrorLog /var/log/apache2/error.trac.log
        CustomLog /var/log/apache2/access.trac.log combined

</VirtualHost>
}}}
Note that you'll also need to make the following change to the apache2.conf file. (which some people don't like doing, I've never understood why not) Make sure that the {{{AddHandler}}} line is uncommented.
{{{
# To use CGI scripts outside /cgi-bin/:
#
AddHandler cgi-script .cgi
}}}

Then, use {{{ sudo a2ensite trac }}} and restart apache, and you're good to go.  Now you have your normal site left as before, running at www.example.com and your trac project running at trac.example.com.  Feel free to go and play with the rewrite rules to pretty it up further, but now, back to the rest of the setup.

I installed my Subversion repository at {{{/var/svn/YourProjectNameHere}}}. So I did a quick starting config of subversion with the following commands:
{{{
sudo mkdir /var/svn
sudo mkdir /var/svn/YourProjectNameHere
sudo mkdir /tmp/YourProjectNameHere
sudo mkdir /tmp/YourProjectNameHere/branches
sudo mkdir /tmp/YourProjectNameHere/tags
sudo mkdir /tmp/YourProjectNameHere/trunk
sudo svnadmin create /var/svn/YourProjectNameHere
sudo svn import /tmp/YourProjectNameHere file:///var/svn/YourProjectNameHere -m "initial import"
sudo rm -rf /tmp/YourProjectNameHere
}}}

Some permissions changes and an apache restart are now needed:
{{{
sudo chown -R www-data /var/svn/YourProjectNameHere
sudo chown -R www-data /usr/share/trac
sudo apache2 -k restart
}}}

Test by web-browsing to {{{http://servername/svn/YourProjectNameHere}}}

If you see a simple web page which says '''Revision 1: /''' and lists ''branches'', ''tags'', and ''trunk'', your Subversion install is up and running! 

Now let's finish the Trac install (but don't go on to Trac install until you have the above working properly).

I put my trac environment at {{{/var/trac/YourProjectNameHere}}}. Of course you could use any other path or name - something a little more descriptive of ''your'' project would probably be a good idea. First I ran these commands:
{{{
sudo mkdir /var/trac
sudo trac-admin /var/trac/YourProjectNameHere initenv
sudo chown -R www-data /var/trac/YourProjectNameHere
}}}
The "trac-admin" command shown above prompted me to enter:

 * the project name ({{{YourProjectNameHere}}})
 * the path to svn repository ({{{/var/svn/YourProjectNameHere}}})
 * the path to the Trac templates directory ({{{/usr/share/trac/templates}}})

... then it prints out a bunch of stuff. If there are no errors you should now be able to surf to your Trac site at '''!http://servername/cgi-bin/trac.cgi'''

At the time I did my install, there was one glitch in the Ubuntu Universe Trac installer. It doesn't install the neo_cgi.so file needed in the python2.4 directory space. So when I surfed to my Trac site, I got the error '''!ImportError: No module named neo_cgi'''. I was able to fix this by symlinking the python2.3 version like so:

{{{
sudo ln -s /usr/lib/python2.3/site-packages/neo_cgi.so /usr/lib/python2.4/site-packages/neo_cgi.so
}}}



''Voila! Your Trac system & website should be up and running.''

----

OPTIONAL: create a redirect file called /var/www/index.html with this one line:
{{{
<META HTTP-EQUIV="Refresh" CONTENT="0; URL=http://10.0.0.102/cgi-bin/trac.cgi">
}}}

... with this change, you can get to Trac with '''!http://servername''' instead of the more cumbersome '''!http://servername/cgi-bin/trac.cgi'''

----
putting your trac.htpasswd file into /var/www might not be such a good idea though, since that might be served by apache to the outside