TVtime is the best application to test wether your TVcard hardware works within Linux. After having installed TVtime, you need to chmod the access rights for the TVtime config folder in your home directory, otherwise the setting changes cannot be written back to disk. The following instructions need to be executed as root.

apt-get install tvtime
cd /home/<user>
chown <user>:<user> .tvtime
chown <user>:<user> .tvtime/*

apt-get install dvb-utils
scan /usr/share/doc/dvb-utils/examples/scan/atsc/us-ATSC-center-frequencies-8VSB >  channel.conf 

gpasswd -a <username> video  # add all mythtv users to group video

apt-get install mythtv mythtv-themes