surfer, какой юмор? нормальный способ!
apt-file search sa-learn
sa-learn-cyrus: /etc/spamassassin/sa-learn-cyrus.conf
sa-learn-cyrus: /usr/sbin/sa-learn-cyrus
sa-learn-cyrus: /usr/share/doc/sa-learn-cyrus/README.Debian
sa-learn-cyrus: /usr/share/doc/sa-learn-cyrus/changelog.Debian.gz
sa-learn-cyrus: /usr/share/doc/sa-learn-cyrus/changelog.gz
sa-learn-cyrus: /usr/share/doc/sa-learn-cyrus/copyright
sa-learn-cyrus: /usr/share/doc/sa-learn-cyrus/sa-learn-cyrus.html
sa-learn-cyrus: /usr/share/doc/sa-learn-cyrus/sa-learn-cyrus.txt.gz
sa-learn-cyrus: /usr/share/man/man8/sa-learn-cyrus.8.gz
spamassassin: /usr/bin/sa-learn
spamassassin: /usr/share/man/man1/sa-learn.1p.gz
в моем случае пакет называется spamassassin