Thanks for your bugreport.
Please remove the cdrom from the sources.list file (e.g. via software-properties-gtk from System/Administration/Software sources) and untick the CDROM.
When that is gone, please try again.
Thanks for your bugreport.
Please remove the cdrom from the sources.list file (e.g. via software- properties- gtk from System/ Administration/ Software sources) and untick the CDROM.
When that is gone, please try again.