Yet another question about Wordpress file permission

Hi all,

I installed a wordpress site on my newly installed Linode. It's ubuntu 10.4 LTS, Apache2.

When I was testing the wordpress posting, the editor didn't allow me to upload and embed an image. I checked the file permission of the wp-content/uploads folder. It's 755. Just to test, I changed that to 777 to allow WP to create ~/uploads/x folders then changed back the permission to 755. After this it is uploading images from the editor.

But I have a feeling that it may not be the permanent solution. As, when this month will end, WP will try to create a new ~uploads/10 and sever will not allow WP to do that(currently it's ~uploads/9 because I selected "Organize my uploads into month- and year-based folders" on WP options)

So I would really appreciate if anyone could tell me the permanent solution without compromising the security issue?

Thanks!