Move from Windows to Unix

Just moved to unix and on windows the plugin was working but now when i try to make a post .. it doesnt show any errors but the image doesnt seems to get attached .. the post gets done staying blank..
I am using the side bar that is working
so which folders do i need to see for the permissions ? .. first time on linux always have been on windows and working with .net envt so if any hinters can help here ? .is there a way to reinstall the plugin without deleting the old posts ? like if i deactive the plugin ALL the old posts lose the images aswell .. so ?

Thanks

http://wordpress.org/extend/plugins/yet-another-photoblog/