how to download things in linux with a sound error?

how to download things in linux with a sound error?

everyone. I'm trying to install drpython on linux mint 15 olivia cinnamon.
here is what I typed:
sudo apt-get install drpython.
the first interactive thing I get is:
WARNING: The following packages cannot be authenticated!
drpython
Install these packages without verification [y/N]?
this did not happen before. after I typed y, at the end I got 4 error lines:
Errors were encountered while processing:
oem-audio-hda-daily-dkms
oem-audio-hda-daily-lts-quantal-dkms
E: Sub-process /usr/bin/dpkg returned an error code (1)
but, it downloaded. This is concerning because I don't know what this
means. I saw the word audio and am concerned.
this started after downloading this for audio over HDMI:
https://code.launchpad.net/~ubuntu-audio-dev/+archive/alsa-daily/+files/oem-audio-hda-daily-lts-raring-dkms_0.201307180554~precise1_all.deb
how can I get the terminal install back to like it was before keeping
audio over HDMI?
thanks in advance.