Plugins not showing up in the ‘Plugin’ section

Which ones didn’t work?

Sometimes a plugin will be in a folder within a folder, and you have to figure out the right method of loading it into the WordPress plugins folder. Some plugins use the folder within a folder but also include a pointer in the first folder that points to the second folder. Others expect you to just upload the second folder so it’s the only one in the WordPress hierarchy. You’ll have to use your FTP client to inspect the folder hierarchy.

Same problem.

spoof@spoofhome:/home/www/wordpress/wp-content/plugins$ ls
akismet  hillo.php  loginlock  zdstats
spoof@spoofhome:/home/www/wordpress/wp-content/plugins$ ls -ld zdstats/
drwxrwxr-x 5 www-data www-data 336 2008-11-28 23:40 zdstats/
spoof@spoofhome:/home/www/wordpress/wp-content/plugins$ ls -l zdstats/
total 28641
drwxr-xr-x 5 www-data www-data     1216 2008-11-28 22:59 cal
drwxr-xr-x 3 www-data www-data      176 2008-11-28 22:59 geoip
-rw-r--r-- 1 www-data www-data 29198413 2008-11-28 23:39 GeoLiteCity.dat
drwxr-xr-x 2 www-data www-data      160 2008-11-28 22:59 lang
-rw-r--r-- 1 www-data www-data     3230 2008-10-15 19:52 readme.txt
-rw-r--r-- 1 www-data www-data      749 2008-10-15 19:52 style.css
-rw-r--r-- 1 www-data www-data     1026 2008-10-15 19:52 zd.javascript.js.php
-rw-r--r-- 1 www-data www-data     1347 2008-10-15 19:52 zd.wp.ajax.php
-rw-r--r-- 1 www-data www-data    78787 2008-10-15 19:52 zd.wp.zdstatistics.class.php
spoof@spoofhome:/home/www/wordpress/wp-content/plugins$ ps auxww | grep apache
...
www-data 12343  0.0  1.4  41732 14920 ?        S    Nov30   0:02 /usr/sbin/apache2 -k start
...

Only Akismet and Hello Dolly plugins are shown.

Problem solved. WordPress searchs plugins by default in /usr/share/wordpress/wp-content/plugins. :-/
Silly IMHO.