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これらのパッケージをインストールできないのはなぜですか？

Ubuntu 12.04 LTSにcurlライブラリをインストールしたい。そのためには、次のコマンドを使用します。Sudoapt-get install libcurl4-openssl-dev。しかし、私は次のようなエラーを受け取りました

    ajay@ajay-K54L:~$ Sudo apt-get install libcurl4-openssl-dev
    [Sudo] password for ajay: 
    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-openssl-dev : Depends: libkrb5-dev but it is not going to be installed
                            Depends: librtmp-dev but it is not going to be installed
    E: Unable to correct problems, you have held broken packages.

依存関係をインストールしようとすると、パッケージが既にインストールされていることが示されます。

   ajay@ajay-K54L:~$ Sudo apt-get install -f libkrb5-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:
     libkrb5-dev : Depends: krb5-multidev (= 1.10+dfsg~beta1-2) but it is not going to be installed
    E: Unable to correct problems, you have held broken packages.
    ajay@ajay-K54L:~$ Sudo apt-get install -f krb5-multidev
    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:
     krb5-multidev : Depends: libkrb5-3 (= 1.10+dfsg~beta1-2) but 1.10+dfsg~beta1-2ubuntu0.3 is to be installed
                     Depends: libk5crypto3 (= 1.10+dfsg~beta1-2) but 1.10+dfsg~beta1-2ubuntu0.3 is to be installed
                     Depends: libgssapi-krb5-2 (= 1.10+dfsg~beta1-2) but 1.10+dfsg~beta1-2ubuntu0.3 is to be installed
    E: Unable to correct problems, you have held broken packages.
    ajay@ajay-K54L:~$ Sudo apt-get install -f libkrb5-3
    Reading package lists... Done
    Building dependency tree       
    Reading state information... Done
    libkrb5-3 is already the newest version.
    0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.

何をする必要がありますか？

私は次のコマンドを試しました

apt-cache policy libkrb5-3 krb5-multidev libk5crypto3 libgssapi-krb5-2 libcurl4-openssl-dev

そしてそれは私に次のような出力を与えます：

ibkrb5-3:
  Installed: 1.10+dfsg~beta1-2ubuntu0.3
  Candidate: 1.10+dfsg~beta1-2ubuntu0.3
  Version table:
 *** 1.10+dfsg~beta1-2ubuntu0.3 0
        100 /var/lib/dpkg/status
     1.10+dfsg~beta1-2 0
        500 http://in.archive.ubuntu.com/ubuntu/ precise/main AMD64 Packages
krb5-multidev:
  Installed: (none)
  Candidate: 1.10+dfsg~beta1-2
  Version table:
     1.10+dfsg~beta1-2 0
        500 http://in.archive.ubuntu.com/ubuntu/ precise/main AMD64 Packages
libk5crypto3:
  Installed: 1.10+dfsg~beta1-2ubuntu0.3
  Candidate: 1.10+dfsg~beta1-2ubuntu0.3
  Version table:
 *** 1.10+dfsg~beta1-2ubuntu0.3 0
        100 /var/lib/dpkg/status
     1.10+dfsg~beta1-2 0
        500 http://in.archive.ubuntu.com/ubuntu/ precise/main AMD64 Packages
libgssapi-krb5-2:
  Installed: 1.10+dfsg~beta1-2ubuntu0.3
  Candidate: 1.10+dfsg~beta1-2ubuntu0.3
  Version table:
 *** 1.10+dfsg~beta1-2ubuntu0.3 0
        100 /var/lib/dpkg/status
     1.10+dfsg~beta1-2 0
        500 http://in.archive.ubuntu.com/ubuntu/ precise/main AMD64 Packages
libcurl4-openssl-dev:
  Installed: (none)
  Candidate: 7.22.0-3ubuntu4
  Version table:
     7.22.0-3ubuntu4 0
        500 http://in.archive.ubuntu.com/ubuntu/ precise/main AMD64 Packages
12.04aptpackage-management
2
User007

apt-cache policyで提供した出力は、古いリストに関する私の疑いを裏付けています。

12.04のkrb5-multidevの例では、1.10+dfsg~beta1-2ubuntu0.3から提供される候補としてバージョンprecise-updatesが表示されます。

krb5-multidev:
  Installed: 1.10+dfsg~beta1-2ubuntu0.3
  Candidate: 1.10+dfsg~beta1-2ubuntu0.3
  Version table:
 *** 1.10+dfsg~beta1-2ubuntu0.3 0
        500 http://nl.archive.ubuntu.com/ubuntu/ precise-updates/main AMD64 Packages
        500 http://security.ubuntu.com/ubuntu/ precise-security/main AMD64 Packages
        100 /var/lib/dpkg/status
     1.10+dfsg~beta1-2 0
        500 http://nl.archive.ubuntu.com/ubuntu/ precise/main AMD64 Packages

したがって、コメントですでに提案したように、実行します

Sudo apt-get update

そして、すべての設定が完了しているはずです（インストールを再試行し、システムを適切に更新してください！）。

2
gertvdijk