Can not install any new software 12.04 lts

[hark2014]

I have a fresh install of 12.04 lts. I have installed QGIS on it (which I need) but otherwise have done nothing. When I attempt to install any other software from the software center I get the error "items cannoot be installed or removed until the package catalog is repaired do you want to repair now"?

I select yes....

installArchives() failed: (Reading database ... (Reading database ... 5% (Reading database ... 10% (Reading database ... 15% (Reading database ... 20% (Reading database ... 25% (Reading database ... 30% (Reading database ... 35% (Reading database ... 40% (Reading database ... 45% (Reading database ... 50% (Reading database ... 55% (Reading database ... 60% (Reading database ... 65% (Reading database ... 70% (Reading database ... 75% (Reading database ... 80% (Reading database ... 85% (Reading database ... 90% (Reading database ... 95% (Reading database ... 100% (Reading database ... 395056 files and directories currently installed.)
Unpacking grass-core (from .../grass-core_6.4.4-2~precise4_amd64.deb) ...
dpkg: error processing /var/cache/apt/archives/grass-core_6.4.4-2~precise4_amd64.deb (--unpack):
trying to overwrite '/usr/bin/x-grass', which is also in package grass 6.4.1-1ubuntu2
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)
Processing triggers for menu ...
Errors were encountered while processing:
/var/cache/apt/archives/grass-core_6.4.4-2~precise4_amd64.deb
Error in function:
SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)
dpkg: dependency problems prevent configuration of qgis-plugin-grass:
qgis-plugin-grass depends on grass644; however:
Package grass644 is not installed.
dpkg: error processing qgis-plugin-grass (--configure):
dependency problems - leaving unconfigured

I have tried everything on this thread (http://ubuntuforums.org/showthread.php?t=2060379) and get the following error when I attempt sudo apt-get autoremove -f



Errors were encountered while processing:
/var/cache/apt/archives/grass-core_6.4.4-2~precise4_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)


And get this error when I attempt sudo dpkg --configure -a



Errors were encountered while processing:
qgis-plugin-grass

[Vladlenin5000]

Please post the errors (if any) of:


sudo apt-get update


How did you installed QGIS? The problem stems from that...

[hark2014]

I have updated several times. I installed it using the software center

[Vladlenin5000]

I have updated several times. I installed it using the software center
Software Center is only one of the many APT frontends.
I specifically asked for errors, not how many time have you updated.
I also asked (in an edit) how have you installed QGIS because the error stems from that installation and that installation ONLY.