Open Synaptic package manager.(Application menu—>Settings—>Synaptic package manager)

Synaptic package manager main window shown in below screenshot.

Click on settings—>Repositories to connect with debian server and download all packages.

Repositories main window shown in below screenshot.

click on “all types” and click on “OK”.

Now all packages will be shown in synaptic package manager.

click on “search” in Synaptic package manager main window.

Search for “Apache 2” as shown in screenshot.

Now,“Apache 2” package shown in synaptic package manager main window as shown in scrrenshot.

Right click on “apache 2” and click on “Mark for installation”.

Click on “Apply” to install “apache 2”.

Follow step 1 to 6 as witten above in “How to install apache 2”.

click on “search” in Synaptic package manager main window.

Search for “php 5” as shown in screenshot.

Now,“php 5” package shown in synaptic package manager main window as shown in scrrenshot.

Right click on “php 5” and click on “Mark for installation”.

Click on “Apply” to install “php 5”.

Follow step 1 to 6 as witten above in “How to install apache 2”.

click on “mariadb” in Synaptic package manager main window.

Search for “mariadb” as shown in screenshot.

Now,“mariadb” package shown in synaptic package manager main window as shown in scrrenshot.

Right click on “mariadb” and click on “Mark for installation”.

Click on “Apply” to install “mariadb”.