I tried installing xmame on my mythtv box.

apt-get install xmame

It didn't work. I've giving up on xmame since I don't play games anyways, but now I'm trying to install lvm-common and the failed xmame install is causing problems.

I tried using apt-get -f install, but get the following:

# apt-get -f install
Reading Package Lists... Done
Building Dependency Tree... Done
Correcting dependencies... Done
The following extra packages will be installed:
libxv1
The following NEW packages will be installed:
libxv1
0 upgraded, 1 newly installed, 0 to remove and 539 not upgraded.
6 not fully installed or removed.
Need to get 0B/165kB of archives.
After unpacking 332kB of additional disk space will be used.
Do you want to continue? [Y/n] y
(Reading database ... 53946 files and directories currently installed.)
Unpacking libxv1 (from .../libxv1_4.3.0.dfsg.1-10_i386.deb) ...
dpkg: error processing /var/cache/apt/archives/libxv1_4.3.0.dfsg.1-10_i386.deb (--unpack):
trying to overwrite `/usr/X11R6/lib/libXv.so.1.0', which is also in package xlibs
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
/var/cache/apt/archives/libxv1_4.3.0.dfsg.1-10_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
#

I would appreciate any help...

To quote the master, perhaps a search http://mysettopbox.tv/phpBB2/search.php of the forum? BTW - Using any of the following strings from the error messages you posted above as search terms will return a small selection of threads with the answer you're looking for: "libxv1", or: "/usr/X11R6/lib/libXv.so.1.0", or: "also in package xlibs", or: ...

See also: http://catb.org/~esr/faqs/smart-questions.html