Comment 4 for bug 424462

My comment above is not entirely accurate.
Once I manually deleted the file apt-mirror.lock (I do not have it the default location of /var/spool/apt-mirror/var/apt-mirror.lock), then apt-mirror continued to work.

However, the stray lock file would have caused the issue above to continue under the current version.
Perhaps, a command line parameter e.g. --reset-lock could be added which the locking error would inform the user about?