libcurl4-gnutls-dev: Depende: libldap2-dev mas não será instalado

libcurl4-gnutls-dev: Depende: libldap2-dev mas não será instalado

Estou tentando instalar o curl em meu servidor Ubuntu, pois recebo esse erro sempre que estou compilando meu código C++ -

fatal error: curl.h: No such file or directory

Abaixo está o erro:

username@phx7b02c-ee1b:~$ sudo apt-get install libcurl4-gnutls-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
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-gnutls-dev : Depends: libldap2-dev but it is not going to be installed
E: Broken packages

Não tenho certeza do que estou fazendo de errado aqui?

Minha versão do kernel:

username@phx7b02c-ee1b:~$ uname -a
Linux phx7b02c-ee1b 2.6.35-22-server #33-Ubuntu SMP Sun Sep 19 20:48:58 UTC 2010 x86_64 GNU/Linux

E também sempre que faço isso - sempre recebo a versão curl

curl --version 

curl 7.21.0 (x86_64-pc-linux-gnu) libcurl/7.21.0 OpenSSL/0.9.8o zlib/1.2.3.4 libidn/1.18 Protocols: dict file ftp ftps http https imap imaps ldap ldaps pop3 pop3s rtsp smtp smtps telnet tftp Features: GSS-Negotiate IDN IPv6 Largefile NTLM SSL libz

Atualizar:-

Isso é o que eu consegui -

/etc/apt/preferences
-bash: /etc/apt/preferences: No such file or directory

/etc/apt/sources.list.d/*.list
-bash: /etc/apt/sources.list.d/ebay-packages.list: Permission denied


/etc/apt/preferences.d/*
-bash: /etc/apt/preferences.d/*: No such file or directory


/etc/apt/sources.list
-bash: /etc/apt/sources.list: Permission denied

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