Tonight I upgraded my Debian Etch servers to Lenny. The whole procedure went like a clockwork, except one thing:
Trac

I access my trac via Apache. With the upgrade the /usr/share/trac/cgi-bin/trac.cgi in

#snip
ScriptAlias /trac /usr/share/trac/cgi-bin/trac.cgi
#snap

was gone. Sad but true.

So I’ve searched through the files that came with trac.
dpkg -L trac

It seems that everything moved to /usr/share/pyshared/trac, but still no trac.cgi. After a little bit more searching the file /usr/share/pyshared/trac/web/cgi_frontend.py came up.

By changing the rights to 755
chmod 755 /usr/share/pyshared/trac/web/cgi_frontend.py
and replacing the ScriptAlias with
ScriptAlias /trac /usr/share/pyshared/trac/web/cgi_frontend.py
it worked like a charm and trac showed up, telling me to do a
trac /path/to/project upgrade
on my project. After that everything was ready, yay!