to get the list of all available php modules on my server, I typed

aptitude search php7-

No list showed up: Then I typed

aptitude search php5-

and the full list of modules was displayed. Then I ran the command below:

aptitude install php5-curl
The following NEW packages will be installed:
  php5-curl
The following packages will be upgraded:
  php5-common
1 packages upgraded, 1 newly installed, 0 to remove and 75 not upgraded.
Need to get 472 kB of archives. After unpacking 143 kB will be used.
The following packages have unmet dependencies:
 libapache2-mod-php5 : Depends: php5-common (= 5.5.9+dfsg-1ubuntu4.14) but 5.5.9+dfsg-1ubuntu4.16 is to be installed.
 php5-mysql : Depends: php5-common (= 5.5.9+dfsg-1ubuntu4.14) but 5.5.9+dfsg-1ubuntu4.16 is to be installed.
 php5-readline : Depends: php5-common (= 5.5.9+dfsg-1ubuntu4.14) but 5.5.9+dfsg-1ubuntu4.16 is to be installed.
 php5-cli : Depends: php5-common (= 5.5.9+dfsg-1ubuntu4.14) but 5.5.9+dfsg-1ubuntu4.16 is to be installed.
 php5-gd : Depends: php5-common (= 5.5.9+dfsg-1ubuntu4.14) but 5.5.9+dfsg-1ubuntu4.16 is to be installed.
The following actions will resolve these dependencies:

     Remove the following packages:
1)     libapache2-mod-php5
2)     php5
3)     php5-cli
4)     php5-gd
5)     php5-mysql
6)     php5-readline

     Leave the following dependencies unresolved:
7)     libapache2-mod-php5 recommends php5-cli


Accept this solution? [Y/n/q/?] y
The following NEW packages will be installed:
  php5-curl
The following packages will be REMOVED:
  fontconfig-config{u} fonts-dejavu-core{u} libapache2-mod-php5{a}
  libfontconfig1{u} libgd3{u} libjbig0{u} libjpeg-turbo8{u} libjpeg8{u}
  libtiff5{u} libvpx1{u} libxpm4{u} php5{a} php5-cli{a} php5-gd{a}
  php5-mysql{a} php5-readline{a}
The following packages will be upgraded:
  php5-common
1 packages upgraded, 1 newly installed, 16 to remove and 67 not upgraded.
Need to get 472 kB of archives. After unpacking 26.7 MB will be freed.
Do you want to continue? [Y/n/?] y
Get: 1 http://mirrors.digitalocean.com/ubuntu/ trusty-updates/main php5-common amd64 5.5.9+dfsg-1ubuntu4.16 [445 kB]
Get: 2 http://mirrors.digitalocean.com/ubuntu/ trusty-updates/main php5-curl amd64 5.5.9+dfsg-1ubuntu4.16 [27.4 kB]
Fetched 472 kB in 3s (144 kB/s)
(Reading database ... 91911 files and directories currently installed.)
Removing php5-gd (5.5.9+dfsg-1ubuntu4.14) ...
php5_invoke prerm: Disable module gd for apache2 SAPI
php5_invoke prerm: Disable module gd for cli SAPI
Removing libgd3:amd64 (2.1.0-3) ...
Removing libfontconfig1:amd64 (2.11.0-0ubuntu4.1) ...
Removing fontconfig-config (2.11.0-0ubuntu4.1) ...
Removing fonts-dejavu-core (2.34-1ubuntu1) ...
Removing php5 (5.5.9+dfsg-1ubuntu4.14) ...
Removing libapache2-mod-php5 (5.5.9+dfsg-1ubuntu4.14) ...
php5_invoke prerm: Disable module json for apache2 SAPI
php5_invoke prerm: Disable module mysqli for apache2 SAPI
php5_invoke prerm: Disable module pdo_mysql for apache2 SAPI
php5_invoke prerm: Disable module pdo for apache2 SAPI
php5_invoke prerm: Disable module opcache for apache2 SAPI
php5_invoke prerm: Disable module readline for apache2 SAPI
php5_invoke prerm: Disable module mysql for apache2 SAPI
Module php5 disabled.
apache2_invoke prerm: Disable module php5
 * Restarting web server apache2                                                AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
                                                                         [ OK ]
Removing libtiff5:amd64 (4.0.3-7ubuntu0.4) ...
Removing libjbig0:amd64 (2.0-2ubuntu4.1) ...
Removing libjpeg8:amd64 (8c-2ubuntu8) ...
Removing libjpeg-turbo8:amd64 (1.3.0-0ubuntu2) ...
Removing libvpx1:amd64 (1.3.0-2) ...
Removing libxpm4:amd64 (1:3.5.10-1) ...
Removing php5-readline (5.5.9+dfsg-1ubuntu4.14) ...
php5_invoke prerm: Disable module readline for cli SAPI
Removing php5-cli (5.5.9+dfsg-1ubuntu4.14) ...
php5_invoke prerm: Disable module json for cli SAPI
php5_invoke prerm: Disable module mysqli for cli SAPI
php5_invoke prerm: Disable module pdo_mysql for cli SAPI
php5_invoke prerm: Disable module pdo for cli SAPI
php5_invoke prerm: Disable module opcache for cli SAPI
php5_invoke prerm: Disable module mysql for cli SAPI
Removing php5-mysql (5.5.9+dfsg-1ubuntu4.14) ...
Processing triggers for libc-bin (2.19-0ubuntu6.7) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
(Reading database ... 91761 files and directories currently installed.)
Preparing to unpack .../php5-common_5.5.9+dfsg-1ubuntu4.16_amd64.deb ...
Unpacking php5-common (5.5.9+dfsg-1ubuntu4.16) over (5.5.9+dfsg-1ubuntu4.14) ...
Selecting previously unselected package php5-curl.
Preparing to unpack .../php5-curl_5.5.9+dfsg-1ubuntu4.16_amd64.deb ...
Unpacking php5-curl (5.5.9+dfsg-1ubuntu4.16) ...
Setting up php5-common (5.5.9+dfsg-1ubuntu4.16) ...
Setting up php5-curl (5.5.9+dfsg-1ubuntu4.16) ...

Creating config file /etc/php5/mods-available/curl.ini with new version

Current status: 67 updates [-9].

Unfortunately, the frontend of my site is now a blank white screen. Is there any way to resolve this.
I server is ubuntu 14.04