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apt-get didn't complain before the messages I pasted.
If I try the

Terminal

sudo apt-get install xbian-update xbian-package-config-shell xbian-package-initramfs-tools xbian-package-xbmc-scripts libhal-storage1 libhal1 xbian-package-config-xbmc xbian-package-kernel xbian-package-lirc xbian-package-xbmc

I get this :

Terminal

Reading package lists... Done
Building dependency tree
Reading state information... Done
xbian-package-config-shell is already the newest version.
xbian-package-config-xbmc is already the newest version.
xbian-package-initramfs-tools is already the newest version.
You might want to run 'apt-get -f install' to correct these:
The following packages have unmet dependencies:
xbian-package-xbmc : Depends: xbian-package-shairplay but it is not going to be installed
Depends: xbian-package-libtag (>= 1.0-2) but it is not going to be installed
Depends: xbian-package-libshairport (>= 1.0-1) but it is not going to be installed
Depends: xbian-package-cec (>= 1.0) but it is not going to be installed
Depends: libmad0 but it is not going to be installed
xbian-update : Depends: unattended-upgrades but it is not going to be installed
Depends: xbian-package-vnc-server (>= 1.0.0-2) but it is not going to be installed
Depends: xbian-package-cec (>= 1.1-0.3) but it is not going to be installed or
xbian-package-cec-6q but it is not installable
PreDepends: autofs but it is not going to be installed
E: Unmet dependencies. Try 'apt-get -f install' with no packages (or specify a solution).

About the other thing, I have to -rm -r all the files listed in the xbian-update.list?

I'm very sorry if I seem stupdi, I'm a newbie with Linux, I vaguely understand the things I do, but have almost zero experience..
Thanks !