Thank you for taking the time to report this issue and help to improve
Ubuntu.
The curl -dev packages in Ubuntu 8.04 are installable, as is the
libldap2-dev package. From the error message, it appears that you had
the hardy-updates repository enabled at one point, but subsequently
disabled it.
Affects me too, more details:
$ sudo apt-get install libldap2-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
