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Obviously I did something wrong...
Can someone help me?

xbian@xbian ~ $ sudo apt-get update
Hit http://mirrordirector.raspbian.org wheezy Release.gpg
Hit http://mirrordirector.raspbian.org wheezy Release
Hit http://archive.raspberrypi.org wheezy Release.gpg
Hit http://archive.raspberrypi.org wheezy Release
Hit http://mirrordirector.raspbian.org wheezy/contrib armhf Packages
Hit http://mirrordirector.raspbian.org wheezy/non-free armhf Packages
Hit http://mirrordirector.raspbian.org wheezy/rpi armhf Packages
Hit http://apt.xbian.org/ wheezy Release.gpg
Hit http://archive.raspberrypi.org wheezy/main armhf Packages
Hit http://apt.xbian.org/ wheezy Release
Hit http://apt.xbian.org/ wheezy/main armhf Packages
Ign http://apt.xbian.org/ wheezy/main Translation-en
Ign http://archive.raspberrypi.org wheezy/main Translation-en
Get:1 http://mirrordirector.raspbian.org wheezy/main armhf Packages [9507 kB]
Ign http://mirrordirector.raspbian.org wheezy/contrib Translation-en
Ign http://mirrordirector.raspbian.org wheezy/main Translation-en
Ign http://mirrordirector.raspbian.org wheezy/non-free Translation-en
Ign http://mirrordirector.raspbian.org wheezy/rpi Translation-en
Fetched 1 B in 28s (0 B/s)
W: Failed to fetch gzip:/var/lib/apt/lists/partial/mirrordirector.raspbian.org_raspbian_dists_wheezy_main_binary-armhf_Packages Hash Sum mismatch

E: Some index files failed to download. They have been ignored, or old ones used instead.
xbian@xbian ~ $ sudo apt-get upgrade
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:
bind9-host : Depends: libbind9-80 (= 1:9.8.4.dfsg.P1-6+nmu1) but 1:9.8.4.dfsg.P1-6+nmu2 is installed
E: Unmet dependencies. Try using -f.
xbian@xbian ~ $ sudo apt-get -f install
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following extra packages will be installed:
bind9-host libdns88 libisc84 libisccfg82 liblwres80
The following packages will be upgraded:
bind9-host libdns88 libisc84 libisccfg82 liblwres80
5 upgraded, 0 newly installed, 0 to remove and 5 not upgraded.
Need to get 0 B/1049 kB of archives.
After this operation, 0 B of additional disk space will be used.
Do you want to continue [Y/n]?
dpkg: unrecoverable fatal error, aborting:
unable to open files list file for package `fontconfig-config': Input/output error
E: Sub-process /usr/bin/dpkg returned an error code (2)

Searching the forum for these error's. They have been discussed numbers of times.

I'm sorry, but I can't find any post that helps me...

it just went away. i did a reboot and then tried again an update & upgrade and it worked.

still, such a errors (specially after they "go away") with reboot are saying, that something is bad. filesystem/memory(due to OC)/or similar.

No, this is an error of the raspbian repository. Nothing to do with us of the user hardware.

but then reboot can not solve the issue

The reboot didn't solve the issue, but the time between the two pollings of the apt repo. If you do an apt-get update while raspbian is also updating their repo, you get errors. If you wait a 15 minutes, then it will work again.

I believe you ;-)