how install complete apache2 and then install

A very simple and straightforward way that worked for me is as follows:

Step 1. First we need to Stop apache2.

>> sudo service apache2 stop
Step 2. Now Uninstall Apache2 and its dependent packages.

>> sudo apt-get purge apache2 apache2-utils apache2.2-bin apache2-common
Step 3. Use autoremove option to get rid of other dependencies.

>> sudo apt-get autoremove
Step 4. find where are configuration files that have not been removed.

whereis apache2

Step 5. Now check If you get a response as follows apache2: /etc/apache2 remove the directory and existing configuration files.

>> sudo rm -rf /etc/apache2