slug back online! :)
After a long-winded filesystem check yesterday i could successful recover my slug. I was unsure if some important files were corrupted and moved to /lost+found. To ensure the itegrity of all packages from dpkg, I installed the tool called «debsums» from the repositories. I execuded “debsums -sa” to see, which files dont match to the md5 sum delivered in every deb-package. I asserted that no files (in which I didnt made consciously a change) were differing from the original md5 sum. Phew!
The other thing, my umts-modem, isnt actually working like it should. Its recognized correctly by the harware abstraction layer, but the network manager cant etablish a connection. I already found a solution by unload the driver and reload it manually (modprobe -r option && modprobe -a option). Afterwards it (somtimes) worked like it should, I try to create an automatic solution with an udev rule, but more on this later.