I've recently tried to update my WordPress-powered website manually via FTP because of an error message that does not let me access the wp admin page. However, while following the manual upgrades instructions, I realized I wasn't able to complete step 1.5 a.k.a "deleting the .maintenance file". The tutorial goes: "If you're upgrading manually after a failed auto-upgrade, delete the file .maintenance from your WordPress directory using FTP. This will remove the "failed update" nag message."
I've looked at a thread ( http://wordpress.org/support/topic/where-is-the-maintenance-file-located-in-the-wordpress-files?replies=9 )about the same problem and the answers mention a root directory path (I don't know how to access this) that is to be followed via FTP. However, given my low level of skills in terms of FTP etc.. I wasn't able to understand clearly how to solve my problem.
Could anyone tell me how to locate/delete a .maintenance file ?