Thread:Project:Support desk/Exception from line 1871 of /w/includes/filerepo/file/LocalFile.php: Could not acquire lock for 'npose n.png.'/reply (5)

I first changed the permission on the wiki folder itself to allow "others" read and write permissions, this didn't propagate to the subfolders, so I changed permissions for others on all the subfolders (and made sure to propagate the change - Ubuntu makes it easy). After that I was able to upload files without any problems.