Need help in apt-get

[choral]

Background
I am really new to linux/GNU.. However, i hope to use a software called Gerris (engineering software) ASAP. To install the package, i have removed the preferences priority pin in apt and have downloaded a few tar ball packages. After installation, i can barely play with gerris and geomview. However, i fail to install GfsView because of crash and broken packages... now, my sound driver and apt-get doesnt work..

With input
apt-get install

Reading Package Lists... Done
Building Dependency Tree... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
libgtkglext1-dev: Depends: libgtkglext1 (= 1.0.6-2.1+b1) but 1.0.6-2.0.1 is to be installed
Depends: libgtk2.0-dev but it is not going to be installed
Depends: libice-dev but it is not going to be installed or
xlibs-dev but it is not going to be installed
Depends: libsm-dev but it is not going to be installed or
xlibs-dev but it is not going to be installed
Depends: libxmu-dev but it is not going to be installed or
xlibs-dev but it is not going to be installed
Depends: libxt-dev but it is not going to be installed or
xlibs-dev but it is not going to be installed
Depends: xlibmesa-gl-dev but it is not going to be installed or
libgl-dev
Depends: xlibmesa-glu-dev or
libglu-dev
libgts-snapshot-dev: Depends: libgts-snapshot (= 0.7.6-061025) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

then i try the apt-get -f install
to fix the broken and crash

Reading Package Lists... Done
Building Dependency Tree... Done
Correcting dependencies... Done
The following extra packages will be installed:
libgts-snapshot
The following NEW packages will be installed:
libgts-snapshot
0 upgraded, 1 newly installed, 0 to remove and 611 not upgraded.
3 not fully installed or removed.
Need to get 0B/185kB of archives.
After unpacking 524kB of additional disk space will be used.
Do you want to continue? [Y/n] y
debconf: unable to initialize frontend: Kde
debconf: (Can't locate Qt.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.8.4 /usr/local/share/perl/5.8.4 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.8 /usr/share/perl/5.8 /usr/local/lib/site_perl .) at /usr/share/perl5/Debconf/FrontEnd/Kde/Wizard.pm line 7, <> line 1.)
debconf: falling back to frontend: Dialog
(Reading database ... 66152 files and directories currently installed.)
Unpacking libgts-snapshot (from .../libgts-snapshot_0.7.6-061025_i386.deb) ...
dpkg: error processing /var/cache/apt/archives/libgts-snapshot_0.7.6-061025_i386.deb (--unpack):
trying to overwrite `/usr/bin/gts2oogl', which is also in package libgts-0.7-5
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
/var/cache/apt/archives/libgts-snapshot_0.7.6-061025_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

instead of using apt-get, i have also tried aptitude

debconf: unable to initialize frontend: Kde
debconf: (Can't locate Qt.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.8.4 /usr/local/share/perl/5.8.4 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.8 /usr/share/perl/5.8 /usr/local/lib/site_perl .) at /usr/share/perl5/Debconf/FrontEnd/Kde/Wizard.pm line 7, <> line 467.)
debconf: falling back to frontend: Dialog
Preconfiguring packages ...
(Reading database ... 66152 files and directories currently installed.)
Unpacking libgts-snapshot (from .../libgts-snapshot_0.7.6-061025_i386.deb) ...
dpkg: error processing /var/cache/apt/archives/libgts-snapshot_0.7.6-061025_i386.deb (--unpack):
trying to overwrite `/usr/bin/gts2oogl', which is also in package libgts-0.7-5
dpkg-deb: subprocess paste killed by signal (Broken pipe)
Errors were encountered while processing:
/var/cache/apt/archives/libgts-snapshot_0.7.6-061025_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
Ack! Something bad happened while installing packages. Trying to recover:
dpkg: dependency problems prevent configuration of libgts-snapshot-dev:
libgts-snapshot-dev depends on libgts-snapshot (= 0.7.6-061025); however:
Package libgts-snapshot is not installed.
dpkg: error processing libgts-snapshot-dev (--configure):
dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of gerris-snapshot:
gerris-snapshot depends on libgts-snapshot-dev (>= 0.7.6); however:
Package libgts-snapshot-dev is not configured yet.
dpkg: error processing gerris-snapshot (--configure):
dependency problems - leaving unconfigured
dpkg: dependency problems prevent configuration of gfsview-snapshot:
gfsview-snapshot depends on gerris-snapshot (>= 0.9.3); however:
Package gerris-snapshot is not configured yet.
dpkg: error processing gfsview-snapshot (--configure):
dependency problems - leaving unconfigured
Errors were encountered while processing:
libgts-snapshot-dev
gerris-snapshot
gfsview-snapshot

i think i should remove snapshot to prevent the dependency problems.. but hope that advise guide could be given.. appreciate for yours help

[craigevil]

Fixing dependencies
dpkg --configure --pending If dpkg quits with an error while apt-get install, upgrade, or dist-upgrading try running this to configure the packages that were already unpacked. Then try apt-get - f install, upgrade, or dist-upgrade -f, and then try apt-get install, upgrade, or dist-upgrade again. Repeat as needed. This usually resolves most dependency problems (also, if it mentions a specific package for some reason, you might want to try installing or removing that package)

You can also try:
The following problem arises again and again:
dpkg: Error when working on /var/cache/apt/archives/........dep ....
tries to overwrite &#187;.....&#171; , which is also in ..... package.
and the apt-get dist-upgrade stops.

To solve that one can do also:
dpkg --force-overwrite -i /var/cache/apt/archives/..........deb
Please look at what exactly stands there after... /apt/archives/... and then next:
apt-get -f install

I take it you tried following the directions here:
1.1 Installing and compiling Gerris
http://gfs.sourceforge.net/tutorial/...00000000000000

apt-cache show gerris
Depends: libc6 (>= 2.3.6-6), libglib2.0-0 (>= 2.10.0), libgts-0.7-5 (>> 0.7.6)

apt-cache show geomview
Depends: lesstif2, libc6 (>= 2.3.6-6), libforms1, libgcc1 (>= 1:4.1.0), libgl1-mesa-glx | libgl1, libglu1-mesa | libglu1, libice6, libsm6, libstdc++6 (>= 4.1.0), libx11-6, libxext6, libxmu6, libxt6

[choral]

dpkg --force-overwrite -i /var/cache/apt/archives/..........deb

this has recovered the apt-get.. and gives following

dpkg - warning, overriding problem because --force enabled:
trying to overwrite `/usr/bin/gts2oogl', which is also in package libgts-0.7-5
dpkg - warning, overriding problem because --force enabled:
trying to overwrite `/usr/bin/gtscheck', which is also in package libgts-0.7-5
dpkg - warning, overriding problem because --force enabled:
trying to overwrite `/usr/lib/libgts-0.7.so.5', which is also in package libgts-0.7-5
Setting up libgts-snapshot (0.7.6-061025) ...
.............................

just another stupid question, why it is needed to be forced overwriten instead of upgrade?

so far, geomview and gerris are working and i have yet processed apt-get or aptitude update/ upgrade due to unstable internet connection.. hopefully, tmr, the program can be fully configured..

Thanks for your help~