Linux Mint 17.3にApache2とPHP（libapache2-mod-php）をインストールできません。

Apache2とPHPは正しくインストールされましたが、libapache2-mod-php何かが間違っています。

インストールしようとしましたが、apt-get次のような結果が出ました。

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:
 gnupg : Depends: libreadline6 (>= 6.0) but it is not going to be installed
 libapache2-mod-php5 : Depends: libssl1.0.0 (>= 1.0.0) but it is not going to be installed
                       Depends: apache2-api-20120211
                       Depends: apache2 (>= 2.4) but it is not going to be installed
                       Depends: php5-common (= 5.5.9+dfsg-1ubuntu4.17) but it is not going to be installed
                       Depends: ucf but it is not going to be installed
                       Depends: tzdata but it is not going to be installed
 libuuid1 : Depends: passwd
 libuuid1:i386 : Depends: passwd:i386
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.

すべてのパッケージをインストールしようとしていますが、すでにインストールされていることがわかります。

また、aptitudeを使用してモジュールをインストールしようとし、次のような結果が得られました。

The following NEW packages will be installed:
  libapache2-mod-php5
0 packages upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 2.212 kB of archives. After unpacking 9.897 kB will be used.
The following packages have unmet dependencies:
 dpkg : Breaks: libapache2-mod-php5 (< 5.6.4+dfsg-3~) but 5.5.9+dfsg-1ubuntu4.17 is to be installed.
The following actions will resolve these dependencies:

     Keep the following packages at their current version:
1)     libapache2-mod-php5 [Not Installed]                



Accept this solution? [Y/n/q/?]
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.

はいを選択しましたが、Apacheを再起動した後に何もインストールされず、phpinfoページが機能しませんでした。

uname -a有用な場合、出力は次のようになります。

Linux julen-Surface-Pro-3 4.4.6-3-surface #tigerite ZEN SMP Tue May 24 13:22:59 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

編集する：出力apt-cache policy dpkg：

dpkg:
  Installed: 1.17.25ubuntu1.2
  Candidate: 1.17.25ubuntu1.2
  Version table:
 *** 1.17.25ubuntu1.2 0
        500 http://ppa.launchpad.net/tigerite/mint-xorg-update/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status
     1.17.5ubuntu5.6 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
     1.17.5ubuntu5 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages