Remove Apache2 in Ubuntu

[Ubuntu] Remove Apache2

1. Stop apache service:
```
sudo service apache2 stop
```

2. Remove and clean up all apache2 packages:
```
sudo apt-get purge apache2 apache2-utils apache2.2-bin apache2-common
```

3. Cleanup
```
sudo apt-get autoremove
```

4. Check any configuration files have not been removed
```
whereis apache2
```

5. If you see response `apache2: /etc/apache2`, remove them:
```
sudo rm -rf /etc/apache2
```