Why can't the Linux file be unlocked if it is locked? ?

Question

The files in the apache2 folder under etc are all locked. Last night someone said that executing this command will unlock it. sudo chmod 777 /etc/apache2 But after trying it, it still doesn’t work. The ubuntu16.04 version used

習慣沉默 · Answer

You only set the permissions of /etc/apache2, you should also set the permissions of sub-files and directories

sudo chmod -R 777 /etc/apache2