Comment 9 for bug 146943

This was probably related, too, pseudo-translated to English:

Reading changelogs... Done
apt-listchanges: Sending: root: apt-listchanges: news from timo-laptop
sh: /usr/sbin/sendmail: not found
Traceback (most recent call last):
  File "/usr/bin/apt-listchanges", line 219, in <module>
    main()
  File "/usr/bin/apt-listchanges", line 203, in main
    apt_listchanges.mail_changes(config.email_address, news, subject)
  File "/usr/share/apt-listchanges/apt_listchanges.py", line 104, in mail_change
s
    fh.write(message.as_string())
IOError: [Errno 32] Broken pipe