I have been trying use apt-get to install a few things but I keep on getting errors dpkg. Here is the log:

Nokia-N800-51-3:~# apt-get install kernel-diablo-modules-extra portmap
Reading package lists... Done
Building dependency tree... Done
portmap is already the newest version.
The following NEW packages will be installed:
kernel-diablo-modules-extra
0 upgraded, 1 newly installed, 0 to remove and 131 not upgraded.
2 not fully installed or removed.
Need to get 0B/159kB of archives.
After unpacking 455kB of additional disk space will be used.
WARNING: The following packages cannot be authenticated!
kernel-diablo-modules-extra
Install these packages without verification [y/N]? y
(Reading database ... 29488 files and directories currently installed.)
Unpacking kernel-diablo-modules-extra (from .../kernel-diablo-modules-extra_2.6.21-200842maemo1.2_all.deb) ...
dpkg: error processing /var/cache/apt/archives/kernel-diablo-modules-extra_2.6.21-200842maemo1.2_all.deb (--unpack):
trying to overwrite `/lib/modules/2.6.21-omap1/extra/lockd.ko', which is also in package rx-34-kernel-modules-extra
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
/var/cache/apt/archives/kernel-diablo-modules-extra_2.6.21-200842maemo1.2_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
Nokia-N800-51-3:~#