Just for the histroy record: In previous versions update-manager used synaptic and not python-apt to install updates (only the partial dist upgrade uses python-apt).
Actually apt and aptdaemon share the same lock files and I cannot reproduce this error.
Have you installed Ubuntu on your hard drive? Do you use a live cd? Do you use a special file system?
Just for the histroy record: In previous versions update-manager used synaptic and not python-apt to install updates (only the partial dist upgrade uses python-apt).
Actually apt and aptdaemon share the same lock files and I cannot reproduce this error.
Have you installed Ubuntu on your hard drive? Do you use a live cd? Do you use a special file system?