rpm gives warning: can't get exclusive lock on /var/lib/rpm/Packages

Hi,

As I got a message on our Redhat Enterprise 4.5, :
Your GPG keyring does not contain public key ...


I copy & paste from https://www.redhat.com/security/team/key.html
those cryptic characters starting from the lines (inclusive)
    -----BEGIN PGP PUBLIC KEY BLOCK-----
         . . . . .
    -----END PGP PUBLIC KEY BLOCK-----


As I saved this file in Windows to a thumb drive & use "cp " to
copy it, there's a lot of ^M characters in this file which I then do
"dos2unix /media/usbdisk/saved_file.txt"
Then copy the converted saved_file.txt to /usr/share/doc/rpm-4.5

& issue using root account :
  rpm --import /usr/share/doc/rpm-4.5/saved_file.txt"
but got the error :
  "warning: can't get exclusive lock on /var/lib/rpm/Packages"

What's the cause of the above error?  I'm using root & the
protection of the saved_file.txt is 755.

I read somewhere that /var/lib/rpm/Packages  could be locked,
so what can I do?  I thought of renaming Packages to something
else & make another copy of Packages :

  mv /var/lib/rpm/Packages  /var/lib/rpm/Packages_2
  cp -p /var/lib/rpm/Packages_2  /var/lib/rpm/Packages

Would this help?  Appreciate any suggestions.


Thanks
U

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