can not install apache2 from ubuntu archive (needs disc instead)?

[Jeroen Janssen]

Hello,

I am trying to install apache2 in Ubuntu Hoary (apt-get updated 5 minutes
ago).

However I get some (strange) remark about needing a CD (instead of the
packages being downloaded from the internet). See below for the console
output:

japj at pc1-japj:~$ sudo apt-get install apache2
Reading Package Lists... Done
Building Dependency Tree... Done
The following extra packages will be installed:
  apache2-common apache2-mpm-worker apache2-utils openssl ssl-cert
Suggested packages:
  lynx www-browser ca-certificates
The following NEW packages will be installed:
  apache2 apache2-common apache2-mpm-worker apache2-utils openssl ssl-cert
0 upgraded, 6 newly installed, 0 to remove and 0 not upgraded.
Need to get 33.0kB/2018kB of archives.
After unpacking 6246kB of additional disk space will be used.
Do you want to continue? [Y/n]
Media Change: Please insert the disc labelled
 ‘Ubuntu 5.04 _Hoary Hedgehog_ - Alpha i386 Binary-1 (20050303)’
in the drive ‘/cdrom/’ and press enter

I tried installing other packages without any problems (from the internet).
What am I doing wrong here?
---
Jeroen Janssen