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I am trying to untar a .gz file , which is stored in the /root folder onto a directory in /mnt/flash2/example

I use the following command:

tar xzf filename.gz --no-same-owner -C /mnt/flash2/example

I get the following error:

tar: filename: Cannot change mode to rwxr-sr-x: Operation not permitted

I found an answer that helped me here:
https://superuser.com/questions/699225/avoid-errors-from-tar-failing-to-restore-directory-permissions

The error basically occurred because the tarball had two folders (with no files) that did not exist on the destination server.
Evidentally the flag --no-overwrite-dir might do the trick.
(See above link)

In my case, I instead manually created those two directories and set the permissions to 755.

When I re-ran the extraction, everything worked perfect!

To recap

Problem:

I was extracting a tar file which had empty WordPress uploads folders 2017 and 2017/01 which were not on the destination server.
tar -zxvf created those two folders on the destination server with folder permissions to 775,

and could not change them to 775..

As per the above link, i believe this may happen only if the tarball has empty directories that are not part of an existing tree that you are replacing.

Solution:

-- try the --no-overwrite-dir flag

-- manually create and set permissions on the missing (empty?) folders