Issues with Fedora 15 install

[Sanjay Arora]

Updating Fedora 15...Encountered an error in Yum...

Finishing rebuild of rpms, from deltarpms
<delta
rebuild>
| 1.0 GB     00:01
Presto reduced the update size by 77% (from 1.0 G to 238 M).
Package(s) data still to download: 101 M
(1/121):
PackageKit-command-not-found-0.6.17-1.fc15.x86_64.rpm
|  46 kB     00:01
warning: rpmts_HdrFromFdno: Header V3 RSA/SHA256 Signature, key ID 069c8460:
NOKEY
Public key for PackageKit-command-not-found-0.6.17-1.fc15.x86_64.rpm is not
installed

Updating still going on...
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