Comment 7 for bug 101926

I still get this bug every once in awhile on my systems.
I deleted the lock file in the var/lib/apt/lists/ directory.
and that still seems to be a good work -around, I am not sure of the cause, maybe a change in the sources.list file.
Sometimes a command in terminal helps with the apt-get problems,
root@UbuntuGustyGibbon710Beta:~# apt-get --fix-missing