Устанавливаем:

# apt-get install man-whatis
Reading Package Lists... Done
Building Dependency Tree... Done
The following NEW packages will be installed:
  man-whatis
0 upgraded, 1 newly installed, 0 removed and 0 not upgraded.
Need to get 20,7kB of archives.
After unpacking 21,0kB of additional disk space will be used.
Get:1 ftp://ftp.linux.kiev.ua noarch/classic man-whatis 1.6g-alt2 [20,7kB]
Fetched 20,7kB in 0s (114kB/s)
Committing changes...
Preparing...                                 ################################################################################################### [100%]
1: man-whatis                                ################################################################################################### [100%]
Running /usr/lib/rpm/posttrans-filetriggers
/usr/sbin/makewhatis: line 365: /var/cache/man/local/whatis: Permission denied
/usr/lib/rpm/whatis.filetrigger failed
error: execution of /usr/lib/rpm/posttrans-filetriggers scriptlet from (null)-(null)-(null) failed, exit status 1
Done.
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При этом права /var/cache/man/local/
drwxr-sr-x 2 root     man 4096 лис  4 19:24 local

А в p6 говорят вот такие
drwxrwsr-t 12 root     man    4096 Апр 30  2009 local