283. gnome-shell-extension-common 3.0.2 and gnome-shell-extensions 3.4.0 conflict

Not sure how this came about but I might have downloaded and install an unsupported .deb (from here I think) at some point at the beginning of Gnome 3.
Following this post will get you back to a conflict-free system BUT it will also remove debs that depend on gnome-shell-extension-common (i.e. packages that you have have downloaded from the web as deb packages. It won't affect normal gnome shell extensions).

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The problem:

Unpacking gnome-shell-extensions (from .../gnome-shell-extensions_3.4.0-2_all.deb) ...
dpkg: error processing /var/cache/apt/archives/gnome-shell-extensions_3.4.0-2_all.deb (--unpack):
 trying to overwrite '/usr/share/locale/fr/LC_MESSAGES/gnome-shell-extensions.mo', which is also in package gnome-shell-extension-common 3.0.2-2
Errors were encountered while processing:
 /var/cache/apt/archives/gnome-shell-extensions_3.4.0-2_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

and

sudo apt-get remove gnome-shell-extension-common 
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 : Depends: gnome-shell-extensions (>= 3.4) but it is not going to be installed
 gnome-shell-extension-alternate-tab : Depends: gnome-shell-extension-common but it is not going to be installed
 gnome-shell-extension-alternative-status-menu : Depends: gnome-shell-extension-common but it is not going to be installed
 gnome-shell-extension-auto-move-windows : Depends: gnome-shell-extension-common but it is not going to be installed
 gnome-shell-extension-dock : Depends: gnome-shell-extension-common but it is not going to be installed
 gnome-shell-extension-gajim : Depends: gnome-shell-extension-common but it is not going to be installed
 gnome-shell-extension-user-theme : Depends: gnome-shell-extension-common but it is not going to be installed
 gnome-shell-extension-windows-navigator : Depends: gnome-shell-extension-common but it is not going to be installed
 gnome-shell-extension-xrandr-indicator : Depends: gnome-shell-extension-common but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

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The solution:

sudo dpkg --force-overwrite -i /var/cache/apt/archives/gnome-shell-extensions_3.4.0-2_all.deb
sudo apt-get install -f
sudo apt-get autoremove gnome-shell-extension-common=3.0.2-1
sudo apt-get update && sudo apt-get upgrade