proftpd package broken, unable to fix

[dubnium]

The proftpd package on my system is broken and I get an error when I try to fix it, reinstall, or remove it. Any insight would be greatly appreciated. I show the various errors I encounter below. The problem will be solved if any one of these commands works without encountering an error...

>> sudo apt-get -f install

Reading package lists... Done
Building dependency tree... Done
Correcting dependencies... Done
The following extra packages will be installed:
  proftpd
Suggested packages:
  proftpd-doc
The following packages will be upgraded:
  proftpd
1 upgraded, 0 newly installed, 0 to remove and 69 not upgraded.
Need to get 0B/360kB of archives.
After unpacking 0B of additional disk space will be used.
Do you want to continue [Y/n]? y
Preconfiguring packages ...
Selecting previously deselected package proftpd.
(Reading database ... 77367 files and directories currently installed.)
Preparing to replace proftpd 1.2.10-27ubuntu3 (using .../proftpd_1.2.10-27ubuntu3.1_i386.deb) ...
invoke-rc.d: unknown initscript, /etc/init.d/proftpd not found.
dpkg: warning - old pre-removal script returned error exit status 100
dpkg - trying script from the new package instead ...
invoke-rc.d: unknown initscript, /etc/init.d/proftpd not found.
dpkg: error processing /var/cache/apt/archives/proftpd_1.2.10-27ubuntu3.1_i386.deb (--unpack):
 subprocess new pre-removal script returned error exit status 100
Errors were encountered while processing:
 /var/cache/apt/archives/proftpd_1.2.10-27ubuntu3.1_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

>>sudo apt-get remove proftpd

Reading package lists... Done
Building dependency tree... Done
The following packages will be REMOVED:
  proftpd
0 upgraded, 0 newly installed, 1 to remove and 69 not upgraded.
Need to get 0B of archives.
After unpacking 1077kB disk space will be freed.
Do you want to continue [Y/n]? y
(Reading database ... 77366 files and directories currently installed.)
Removing proftpd ...
invoke-rc.d: unknown initscript, /etc/init.d/proftpd not found.
dpkg: error processing proftpd (--remove):
 subprocess pre-removal script returned error exit status 100
Errors were encountered while processing:
 proftpd
E: Sub-process /usr/bin/dpkg returned an error code (1)

The same errors are encountered when I try using synaptic to fix/remove/install proftpd. Let me know if you have any idea how to fix this or if you need any additional info.

[craigevil]

Try killing the process first: sudo /etc/init.d/proftpd stop

The remove and reinstall it.

[dubnium]

Trying your suggestion:

Try killing the process first: sudo /etc/init.d/proftpd stop

Has the following result:
$ sudo /etc/init.d/proftpd stop

sudo: /etc/init.d/proftpd: command not found

proftpd isn't working, which is why it needs to be reinstalled in the first place.