programming error in aptdaemon

[Prashant]

An unhandlable error occured

There seems to be a programming error in aptdaemon, the software that allows you to install/remove software and to perform other package management related tasks. Please report this error at http://launchpad.net/aptdaemon/+filebug and retry.

Details:

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 179, in _process_transaction
    self.commit_packages(*self.trans.packages)
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 227, in commit_packages
    self._commit_changes()
  File "/usr/lib/python2.6/dist-packages/aptdaemon/worker.py", line 738, in _commit_changes
    self._cache.commit(fetch_progress, inst_progress)
  File "/usr/lib/python2.6/dist-packages/apt/deprecation.py", line 98, in deprecated_function
    return func(*args, **kwds)
  File "/usr/lib/python2.6/dist-packages/apt/cache.py", line 427, in commit
    res = self.install_archives(pm, install_progress)
  File "/usr/lib/python2.6/dist-packages/apt/deprecation.py", line 98, in deprecated_function
    return func(*args, **kwds)
  File "/usr/lib/python2.6/dist-packages/apt/cache.py", line 394, in install_archives
    install_progress.finish_update()
  File "/usr/lib/python2.6/dist-packages/aptdaemon/progress.py", line 264, in finish_update
    lock.status_lock.acquire()
  File "/usr/lib/python2.6/dist-packages/aptdaemon/lock.py", line 66, in acquire
    raise LockFailedError(self.path, process)
LockFailedError

[appas (matias-wilkman)]

I get this when trying to install Blackmagic DeckLink drivers, v 7.8.1-i386 in Ubuntu 10.10 Software Center, with aptdaemon 0.31+bzr506-0ubuntu4. With command-line dpkg, I get
dpkg: error processing DeckLink-7.8.1rc6-i386.deb (--install):
 parse error, in file '/var/lib/dpkg/tmp.ci/control' near line 7 package 'decklink':
 duplicate value for `Depends' field
Errors were encountered while processing:
 DeckLink-7.8.1rc6-i386.deb