Update 'README.md'

README.md

@@ -10,7 +10,16 @@ $ cd /etc/apt/sources.list.d
 $ ls 
 docker.list  elementary.list  owncloud.list  patches.list
 ```
-so first we need to list the repositories to determine which will be removed:
+then just remove the non wanted `.list` directory by:
+
+```
+$ sudp rm owncloud.list 
+```
+considering that we want to delete the `owncloud` repository.
+
+
+
+Other for to do it is by using the `apt-key del` command, if there is a gpg reposotory. Thus, first we need to list the repositories to determine which will be removed:
 ```
 $ sudo apt-key list