Hey there! here is what that file looks like on my personal server:
Code:
# ls -lah /etc/cpupdate.conf
-rw-r--r--. 1 root root 87 May 11 16:14 /etc/cpupdate.conf
It's also possible you set an immutable bit with chattr, which would show up with this command:
Code:
# lsattr /etc/cpupdate.conf
-------------e-- /etc/cpupdate.conf
Can you post the output of those two commands on your system so we can compare the permissions?