Iceweasel reinstall - defect package

Hey Guys =)
so i installed Kali yesterday, and i didnt like the Iceweasel browser, so i installed firefox and chromium and uninstalled iceweasel.
then i decided i don't like gnome-fallback either, and wanted to install gnome 3. I found a nice guide too, and did this:

Code:

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root@kali:/home/oxymoronist# apt-get install gnome-core kali-defaults kali-root-login desktop-base
Reading package lists... Done
Building dependency tree     
Reading state information... Done
desktop-base is already the newest version.
desktop-base set to manually installed.
gnome-core is already the newest version.
kali-defaults is already the newest version.
kali-root-login is already the newest version.
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 gnome-core : Depends: iceweasel (>= 10) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
root@kali:/home/oxymoronist# apt-get -f install iceweasel
Reading package lists... Done
Building dependency tree     
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libmozjs22d openjdk-7-jre-lib python-apsw xulrunner-22.0
Use 'apt-get autoremove' to remove them.
Suggested packages:
  fonts-oflb-asana-math fonts-mathjax mozplugger
The following NEW packages will be installed:
  iceweasel
0 upgraded, 1 newly installed, 0 to remove and 10 not upgraded.
2 not fully installed or removed.
Need to get 0 B/2,870 kB of archives.
After this operation, 7,034 kB of additional disk space will be used.
(Reading database ... 371903 files and directories currently installed.)
Unpacking iceweasel (from .../iceweasel_24.5.0esr-1~deb7u1_i386.deb) ...
dpkg-divert: error: `diversion of /usr/bin/firefox to /usr/bin/firefox.real by iceweasel' clashes with `diversion of /usr/bin/firefox to /usr/bin/firefox.ubuntu by firefox-mozilla-build'
dpkg: error processing /var/cache/apt/archives/iceweasel_24.5.0esr-1~deb7u1_i386.deb (--unpack):
 subprocess new pre-installation script returned error exit status 2
Processing triggers for menu ...
Errors were encountered while processing:
 /var/cache/apt/archives/iceweasel_24.5.0esr-1~deb7u1_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
root@kali:/home/oxymoronist# apt-get -f install gnome-core kali-defaults kali-root-login desktop-base
Reading package lists... Done
Building dependency tree     
Reading state information... Done
desktop-base is already the newest version.
desktop-base set to manually installed.
gnome-core is already the newest version.
kali-defaults is already the newest version.
kali-root-login is already the newest version.
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
 gnome-core : Depends: iceweasel (>= 10) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
root@kali:/home/oxymoronist#

---

what else can i try? gnome 3 seems to be installed, but does not work - instead gnome-fallback is running. there comes an error message that gnome3 does not work and instead gnome-fallback is running (i LOVE sentences like these).
gnome is dependent on Iceweasel, i guess, but iceweasel is defect. so installing Iceweasel should fix the problem, right? but how? apt-get -f install does not work.

thank you, complAxx

Hey complAxx,
I have the exact same problem!
Fresh Kali install, removed iceweasel and installed firefox, and now any time I try to use apt-get, it throws a very similar thing as yours. I have been googleing this for a while but no luck.

Here it is:
kaleb@Sherlock:/$ sudo apt-get install beep
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
gnome-core : Depends: iceweasel (>= 10) but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).
kaleb@Sherlock:/$ sudo apt-get -f install
sudo: unable to resolve host Sherlock
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following package was automatically installed and is no longer required:
gdbserver
Use 'apt-get autoremove' to remove it.
The following extra packages will be installed:
iceweasel
Suggested packages:
fonts-stix otf-stix fonts-oflb-asana-math fonts-mathjax mozplugger
The following NEW packages will be installed:
iceweasel
0 upgraded, 1 newly installed, 0 to remove and 4 not upgraded.
568 not fully installed or removed.
Need to get 0 B/2,871 kB of archives.
After this operation, 7,362 kB of additional disk space will be used.
Do you want to continue [Y/n]? y
(Reading database ... 414516 files and directories currently installed.)
Unpacking iceweasel (from .../iceweasel_24.6.0esr-1~deb7u1_i386.deb) ...
dpkg-divert: error: `diversion of /usr/bin/firefox to /usr/bin/firefox.real by iceweasel' clashes with `diversion of /usr/bin/firefox to /usr/bin/firefox.ubuntu by firefox-mozilla-build'
dpkg: error processing /var/cache/apt/archives/iceweasel_24.6.0esr-1~deb7u1_i386.deb (--unpack):
subprocess new pre-installation script returned error exit status 2
Processing triggers for menu ...
Errors were encountered while processing:
/var/cache/apt/archives/iceweasel_24.6.0esr-1~deb7u1_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

So, gnome-core depends on iceweasel (kinda fishy... why?) and apt-get won't let me do anything until it is resolved. But when going ahead and installing iceweasel it is stopped by firefox (makes sense).

This seems like an easy fix but I can't find it.