to disable it is
in command line after that you have to restart apache by
/etc/init.d/apache2 restart. But... wait a second here ... I did all these but my Habari install was still not OK. I have the blog and first entry correctly displayed but none of the links in the blog was working. It must be a rewrite_rule issue, i.e. rewrite module wasn't working.
phpinfo()doesn't tell me the correct fact as well. It was a particular apache issue with ubuntu.
I googled this (a good post here and there) and eventually found that file 000-default in /etc/apache2/sites-enabled has to be edited to set
AllowOverride AllThe proper way I think is to add below lines between Directory tags.
[Directory /var/www/habari/ ]
where 'habari' is the subfolder where you want the mod_rewrite magic to work. I guess there are still a lot of Apache I need to know.