walterwoj@Walter-Server:~$ sudo apt-get upgrade ddclient
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be upgraded:
  ddclient
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 64.6 kB of archives.
After this operation, 1,024 B disk space will be freed.
Do you want to continue [Y/n]? y
Get:1 http://ppa.launchpad.net/ian-hawdon/ddclient/ubuntu/ precise/main ddclient i386 3.8.1-1ubuntu1opezy1 [64.6 kB]
Fetched 64.6 kB in 1s (61.8 kB/s)
Preconfiguring packages ...
(Reading database ... 169331 files and directories currently installed.)
Preparing to replace ddclient 3.8.0-11.4ubuntu1 (using .../ddclient_3.8.1-1ubuntu1opezy1_i386.deb) ...
Unpacking replacement ddclient ...
Processing triggers for man-db ...
Processing triggers for ureadahead ...
ureadahead will be reprofiled on next reboot
Setting up ddclient (3.8.1-1ubuntu1opezy1) ...
FATAL:    Error loading the Perl module Digest::SHA1 needed for freedns update.
FATAL:     On Debian, the package libdigest-sha1-perl must be installed.