ソフトウェアの更新やってみたらrootのパスワード入れた後
エラーメッセージが出て更新できないよ。

failed to install signature: Traceback (most recent call last):
File "/usr/share/PackageKit/helpers/yum/yumBackend.py", line 2931, in install_signature
self.yumbase.getKeyForPackage(pkg, askcb = lambda x, y, z: True)
File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 4329, in getKeyForPackage
result = ts.pgpImportPubkey(misc.procgpgkey(info['raw_key']))
File "/usr/lib/python2.6/site-packages/rpmUtils/transaction.py", line 59, in __getattr__
return self.getMethod(attr)
File "/usr/lib/python2.6/site-packages/rpmUtils/transaction.py", line 69, in getMethod
return getattr(self.ts, method)
AttributeError: 'NoneType' object has no attribute 'pgpImportPubkey'