I was confused about this for quite a long while, but now I find the answer and I am going to let you know.
A past post of mine mentioned
sudo apt-get install lamp-server^ . What does it mean?
Actually, the ^ here makes
apt-get behave as
In other words, it’s an alternative of
tasksel. So the following command behaves the same:
$ sudo tasksel install lamp-server
You may be interested in the official document HERE