I have read all of the forums. I do not have a .lock file until I try to open LR (when I get the error). I have ensured that all of my permissions are set correctly. Please help. I have been using LR for years and have never encountered this problem. I am using LR CC (via subscription).
You need to enable Read/Write permissions for the location where the catalog resides.
My permissions say that read and write are allowed.
Ensure it is the actual sub-folder and not the just the drive or holding folder. e.g. The pictures folder may have the correct permission but the catalog folder may still require setting.
To be sure change the permissions again, this sometimes can work!