Comment 3 for bug 780406

Confirmed fixed in lucid with landscape-client-11.07.1.1-0ubuntu0.10.04.0 from proposed:

root@ls1-lucid:/var/lib/smart# apt-cache policy landscape-client
landscape-client:
  Installed: 11.07.1.1-0ubuntu0.10.04.0
  Candidate: 11.07.1.1-0ubuntu0.10.04.0
  Version table:
 *** 11.07.1.1-0ubuntu0.10.04.0 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid-proposed/main Packages
        100 /var/lib/dpkg/status
     11.02-0ubuntu0.10.04.1 0
        500 http://security.ubuntu.com/ubuntu/ lucid-updates/main Packages
     1.5.0.1-0ubuntu0.10.04.0 0
        500 http://us.archive.ubuntu.com/ubuntu/ lucid/main Packages

I fixed the sources.list entry I had corrupted to test bug #732490 and the error is gone:

==> /var/log/landscape/package-reporter.log <==
2011-07-27 23:44:49,838 INFO [MainThread] Queuing message with changes in known packages: 0 installed, 633 available, 0 available upgrades, 0 locked, 0 not installed, 0 not available, 0 not available upgrades, 0 not locked.

The alert was also cleared in Landscape (see attached sceenshot).