When I turned on my laptop this evening, I was greeted with the following error when I opened Synaptic:
E:Encountered a section with no Package: header, E:Problem with MergeList /var/lib/apt/lists/us.archive.ubuntu.com_ubuntu_dists_natty_main_binary-i386_Packages, E:The package lists or status file could not be parsed or opened
After trying a few times to resolve the problem, the following made everything happy again:
sudo rm -f /var/lib/apt/lists/*
sudo apt-get update
My experience with 11.04 over the past month has been more problematic than past versions of Ubuntu.