the manual is there in compressed form: ls -l /usr/share/doc/unison/unison-manual.txt.gz -rw-r--r-- 1 root root 71282 Apr 2 17:08 /usr/share/doc/unison/unison-manual.txt.gz
but the doc-base file expects it uncompressed.
signature.asc
Description: OpenPGP digital signature