Sharing a folder

[Bill]

Hi

I am using Mint 21.2 - Mate.

On my computer, I have a folder that should be a folder that ALL users 
should have read, write, create and delete permission. The problem is 
that the folder called /home/common and should not be associated with 
any single user.  (There never was a user called "common".)  The user 
that created this folder had their user account deleted but the folder 
_as intended_ persists.

The problem is that the owner of some of the files is the deleted user 
and access to these files are not accessible to everyone. How can I 
change the permissions of all the files in /home/common so that

1. Allow all other users full access to all the files in the "common" 
folder.

2. the owner of all the files in this folder is the administrator (or 
root?) of the computer.  (Maybe this step is not necessary.)

This should not be too difficult but, at the moment, I don't know how to 
proceed.

Best wishes,

Bill Stanley
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