apt-get can't get lock after kubuntu natty pre-beta install

[Glen Ditchfield]

Binary package hint: ubiquity

I created a live session USB key from the Kubuntu desktop i386 20110329.1 image, natty-desktop-i386.iso, and installed from it. I specified manual partitioning, putting "/" on a formatted btrfs system.

After the installation I booted the new Natty system. I tried to run "sudo apt-get update" at the command line, and got errors:
  E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)
  E: Unable to lock directory /var/lib/apt/lists/

/var/lib/apt/lists/lock exists, with size zero and permissions -rw-r-----.

[Jonathan Riddell (jr)]

It's not unusual for another process to be using apt, maybe kpackagekit or apt's daily update. Did you look for processes that were using apt? Is the lock permanantly there or has it gone away now?

[Glen Ditchfield (gjditchfield)]

The lock file is permanent, but it's presence doesn't seem to be the cause, because I can't reproduce the error today. Perhaps another process was holding it, and my timing was unlucky.