Lion software update didn't find updates

Question

Lion 10.7.2 fresh install (not upgrade). Software updates always says "Your software is up to date. Software Update doesn’t have any new software for your computer at this time." Same result after applying  10.7.3 Combo update. Many errors in console log like that:
com.apple.SecurityServer
Failed to authorize right 'system.install.app-store-software' by client '/System/Library/PrivateFrameworks/PackageKit.framework/Versions/A/Resources/in stalld' [5998] for authorization created by '/System/Library/CoreServices/Software Update.app' [5993]
om.apple.SecurityServer
Failed to authorize right 'system.install.software' by client '/System/Library/PrivateFrameworks/PackageKit.framework/Versions/A/Resources/in stalld' [5998] for authorization created by '/System/Library/CoreServices/Software Update.app' [5993]
Software Update
Can't instantiate distribution from http://swcdn.apple.com/content/downloads/11/37/061-7026/2CcV3gkxKTC3tB6yqMYs6fRm 3jDPw9kxMM/061-7026.English.dist: Error Domain=NSXMLParserErrorDomain Code=4 "Line 1: Document is empty
" UserInfo=0x7f93d843aa00 {NSLocalizedDescription=Line 1: Document is empty
I don't want to find and download updates manualy - I need automatic updates. Searching web a lot - no answer. Please help.

Answer 1

Back up all data.
Boot from your recovery partition by holding down the key combination command-R at the startup chime. Release the keys when you see a gray screen with a spinning dial.
When the Recovery desktop appears, reinstall the Mac OS. You don't need to erase the boot volume, and you won't need your backup unless something goes wrong. If your Mac didn’t ship with Lion, you’ll need the Apple ID and password you used to upgrade, so make a note of those before you begin.