I installed the LAMP stack on my Ubuntu 11.04 (Natty Narwhal) with

sudo apt-get install lamp-server^

Now I navigate to /var/www and use

wget http://ftp.drupal.org/files/projects/drupal-7.x-dev.tar.gz

I get the following error.

 --2011-08-03 13:59:00-- 

 http://ftp.drupal.org/files/projects/drupal-7.x-dev.tar.gz Resolving

 ftp.drupal.org... 64.50.233.100, 64.50.236.52 Connecting to

 ftp.drupal.org|64.50.233.100|:80... connected. HTTP request sent,

 awaiting response... 200 OK Length: 2757101 (2.6M)

 [application/x-gzip] drupal-7.x-dev.tar.gz: Permission denied



 Cannot write to `drupal-7.x-dev.tar.gz' (Permission denied).

How do I resolve this error?

I tried to download the same file in the downloads folder, and it went on without an issue. So it seems to be some permission error, but I'm not sure about that or how to solve it.