server1:~# apt-get install proftpd
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
  proftpd-doc
The following NEW packages will be installed
  proftpd
0 upgraded, 1 newly installed, 0 to remove and 13 not upgraded.
Need to get 0B/913kB of archives.
After this operation, 2404kB of additional disk space will be used.
Preconfiguring packages ...
Selecting previously deselected package proftpd.
(Reading database ... 42669 files and directories currently installed.)
Unpacking proftpd (from .../proftpd_1.3.1-6+b1_i386.deb) ...
Setting up proftpd (1.3.1-6+b1) ...
--------- IMPORTANT INFORMATION FOR XINETD USERS ----------
The following line will be added to your /etc/inetd.conf file:

ftp    stream   tcp     nowait  root  /usr/sbin/tcpd /usr/sbin/proftpd

If you are indeed using xinetd, you will have to convert the
above into /etc/xinetd.conf format, and add it manually. See
/usr/share/doc/xinetd/README.Debian for more information.
You must use option -daemon_dir if you use tcpd
-----------------------------------------------------------

dpkg: error processing proftpd (--configure):
 subprocess post-installation script returned error exit status 128
Errors were encountered while processing:
 proftpd
E: Sub-process /usr/bin/dpkg returned an error code (1)
server1:~#