Newbie here. I've search around for a fix for the following, but can't seem to find anything. Can someone please help? Please forgive if I posted this in the wrong section.

root@modem:~# apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
  backtrack-discovery backtrack-enumeration backtrack-network
The following packages will be upgraded:
1 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
Need to get 0B/962kB of archives.
After this operation, 2388kB of additional disk space will be used.
Do you want to continue [Y/n]? y
(Reading database ... 250155 files and directories currently installed.)
Preparing to replace kismet 0.1-bt0 (using .../kismet_2008-05-R1-4_i386.deb) ...
Unpacking replacement kismet ...
dpkg: error processing /var/cache/apt/archives/kismet_2008-05-R1-4_i386.deb (--unpack):
 trying to overwrite `/usr/bin/kismet', which is also in package kismet-newcore
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Processing triggers for menu ...
Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)