Unmet Dependencies - some repositories troubleshooting required.

DeepBlue

me@me-desktop:~$ sudo apt-get install build-essential autoconf apache2 automake libtool libncurses5-dev libncursesw5-dev libcurl4-openssl-dev screen openssl php5 php5-cli libapache2-mod-php5 curl libcppunit-dev libsigc++-2.0-dev subversion php5-cgi libapache2-mod-scgi
Reading package lists... Done
Building dependency tree       
Reading state information... Done
screen is already the newest version.
openssl is already the newest version.
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libcurl4-openssl-dev : Depends: libldap2-dev but it is not going to be installed
E: Broken packages
me@me-desktop:~$

The above is the sort of problem I'm running into a lot since upgrading to Xubuntu 10.10.
A lot of HOWTO's that I follow for installing various programs run into this unmet dependency problem so I wonder if there is a problem with how I've specified my repositories.

My /etc/apt/sources.list is below. Is there anything that jumps out as being incorrect or missing?

# deb cdrom:[Xubuntu 10.10 _Maverick Meerkat_ - Release i386 (20101008.1)]/ maverick main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.

deb http://ie.archive.ubuntu.com/ubuntu/ maverick main restricted
deb-src http://ie.archive.ubuntu.com/ubuntu/ maverick main restricted

## Major bug fix updates produced after the final release of the
## distribution.

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://ie.archive.ubuntu.com/ubuntu/ maverick universe
deb-src http://ie.archive.ubuntu.com/ubuntu/ maverick universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://ie.archive.ubuntu.com/ubuntu/ maverick multiverse
deb-src http://ie.archive.ubuntu.com/ubuntu/ maverick multiverse

## Uncomment the following two lines to add software from the 'backports'
## repository.
## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
# deb http://ie.archive.ubuntu.com/ubuntu/ maverick-backports main restricted universe multiverse
# deb-src http://ie.archive.ubuntu.com/ubuntu/ maverick-backports main restricted universe multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
# deb http://extras.ubuntu.com/ubuntu maverick main
# deb-src http://extras.ubuntu.com/ubuntu maverick main

deb http://security.ubuntu.com/ubuntu maverick-security main restricted
deb-src http://security.ubuntu.com/ubuntu maverick-security main restricted
deb http://security.ubuntu.com/ubuntu maverick-security universe
deb-src http://security.ubuntu.com/ubuntu maverick-security universe
deb http://security.ubuntu.com/ubuntu maverick-security multiverse
deb-src http://security.ubuntu.com/ubuntu maverick-security multiverse
deb http://archive.canonical.com/ubuntu maverick partner
deb-src http://archive.canonical.com/ubuntu maverick partner

pickarooney

I'm running Xubuntu 10.10 and those packages all installed fine.

I'll attach my sources file followed by the list of extra repositories in /apt/etc/sources.d