LinuxQuestions.org - [SOLVED] how to use AOLServer and Apache on same machine at different ports

I am using a Ubuntu virtual machine.Where I installed OpenACS which depends upon AOLServer.To do so I had first shutdown Apache on this machine and then as per instructions given here

http://openacs.org/xowiki/ubuntu

Step 1)

Quote:

aptitude install postgresql

Step 2)

Quote:

aptitude install openacs

I had to shutdown Apache to do above installation.
Now the installation finishes.So I can access http://localhost:8000

but when ever I try to start Apache on this machine which was shutdown during installation I see the error
service apache2 start

Quote:

* Starting web server apache2 (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
Unable to open logs

So I thought may be OpenACS installs AOLServer so Aolserver might be listening on port 80 I check

Quote:

/etc/aolserver4/conf.d/openacs.sh

and here

Quote:

AOL_USER=www-data
AOL_GROUP=www-data
AOL_ADDRESS=192.168.1.15
AOL_PORT=8000
RUN_DAEMON=yes

So AOLServer is not listening on port 80 upto here it is confirmed.

Code:

 netstat -tualp  | grep 80

tcp  0      0 somemachine.somedimain.:8000 *:*  LISTEN  21321/aolserver4-ns

so netstat shows only 8000 in use.
Then why am I unable to start Apache in this case?