Drush problems with... json?

PHP Warning: Module 'json' already loaded in Unknown on line 0
drush 5.x-1.0-beta4

Followed these instructions (modified for Apache) but they didn't help.

(If you've installed the module php5-json and get warnings like this one:

PHP Warning: Module 'json' already loaded in Unknown on line 0

it means that the module got loaded twice. Open /etc/php5/cgi/php.ini, scroll down to the end and comment out the line extension=json.so:

vi /etc/php5/cgi/php.ini

[...]
;extension=json.so
[...]

Then restart Lighttpd again:

/etc/init.d/lighttpd restart

The warnings should now be gone.)

Resolution