I have a CUPS related problem and as part of my problem solving efforts I followed some misguided advice and used some program or other that should prevent the system from tampering with a configuration file. The file could now not be moved, deleted, replaced, chowned or chmoded. The advice, however, did nothing to solve the problem and I turned my attention to other things.
Now, however I need to edit the file and have in the meantime forgotten what I did to 'freeze' the file and so do not know how to 'unfreeze' it.
Any suggestions as to what I might have done and how it can be undone? Obviously we're not talking chmod or chown as neither is able to touch the file while I'm logged in as root (even though it belongs to the root user) - the reply to 'chmod 777 printers.conf' is:
chmod: changing permissions of `printers.conf': Operation not permitted