It would appear most likely that this is caused by the line that runs:
su - $OWNER -c "sa-update --gpghomedir /var/lib/spamassassin/sa-update-keys --import /usr/share/spamassassin/GPG.KEY"
It would appear most likely that this is caused by the line that runs:
su - $OWNER -c "sa-update --gpghomedir /var/lib/ spamassassin/ sa-update- keys --import /usr/share/ spamassassin/ GPG.KEY"