Install, Uninstall, Remove and reinstall apache2

To see which is installed:

dpkg -l | grep apache

To install apache2 on ubuntu:

sudo apt-get install apache2 apache2.2-common

To remove

sudo apt-get remove apache2 apache2.2-common --purge

apt-get -o DPkg::Options::="--force-confmiss" --reinstall install apache2.2-common

Enable .htaccess in apache2

Go to /etc/apache2/sites-available
sudo vi default
Change 'AllowOverride None' to 'AllowOverride All'

and restart:
sudo /etc/init.d/apache2 restart

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Note: Should be done by:
add new entry in /etc/apache2/sites-available and
Add by:
sudo a2ensite [name] // Means that there will be a new link in /etc/apache2/sites-enabled

Remove by:
sudo a2dissite [name]