sudo aptitude purge apache2-common
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initializing package states... Done
Building tag database... Done
The following packages are BROKEN:
  apache2-mpm-worker
The following packages have been automatically kept back:
  irb1.8 libopenssl-ruby1.8 libreadline-ruby1.8 rdoc1.8 ri1.8
The following packages will be REMOVED:
  apache2-common{p}
0 packages upgraded, 0 newly installed, 1 to remove and 5 not upgraded.
Need to get 0B of archives. After unpacking 3142kB will be freed.
The following packages have unmet dependencies:
  apache2-mpm-worker: Depends: apache2-common (= 2.0.55-4ubuntu4) but it is not installable
Resolving dependencies...
The following actions will resolve these dependencies:

Remove the following packages:
apache2
apache2-mpm-worker

Install the following packages:
thttpd [2.23beta1-4 (edgy)]

Score is -361

Accept this solution? [Y/n/q/?] y
The following packages have been automatically kept back:
  irb1.8 libopenssl-ruby1.8 libreadline-ruby1.8 rdoc1.8 ri1.8
The following NEW packages will be automatically installed:
  thttpd
The following packages will be automatically REMOVED:
  apache2 apache2-mpm-worker
The following NEW packages will be installed:
  thttpd
The following packages will be REMOVED:
  apache2 apache2-common{p} apache2-mpm-worker
0 packages upgraded, 1 newly installed, 3 to remove and 5 not upgraded.
Need to get 53.4kB of archives. After unpacking 3506kB will be freed.
Do you want to continue? [Y/n/?] y
Writing extended state information... Done
Get:1 http://nl.archive.ubuntu.com edgy/universe thttpd 2.23beta1-4 [53.4kB]
Fetched 53.4kB in 0s (293kB/s)
(Reading database ... 63689 files and directories currently installed.)
Removing apache2 ...
Removing apache2-mpm-worker ...
invoke-rc.d: unknown initscript, /etc/init.d/apache2 not found.
(Reading database ... 63682 files and directories currently installed.)
Removing apache2-common ...
Purging configuration files for apache2-common ...
Selecting previously deselected package thttpd.
(Reading database ... 63257 files and directories currently installed.)
Unpacking thttpd (from .../thttpd_2.23beta1-4_i386.deb) ...
Setting up thttpd (2.23beta1-4) ...
Updating rc.d symbolic links to start thttpd upon booting.
Starting thttpd ...