fedora18 installed chrome

warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID 7fac5991

picasa-3.0.5744-02.i386.rpm 的公钥没有安装
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解决办法：（来自Google官方帮助： ）

Run these commands as root:

wget
rpm --import linux_signing_key.pub

You can verify the key installation by running:

rpm -qi gpg-pubkey-7fac5991-*

To manually verify an RPM package, you can run the command:

rpm --checksig -v packagename.rpm

RPM can verify and install packages, but it doesn't interact with repositories directly. See the other for information on configuring your system to use the Google repositories.