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Three Ubuntu 12.04 + Xfce problems

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http://askubuntu.com – sorry to bother you, but I wanted to set up a minimal Ubuntu 12.04 with minimal Xfce and probably due to my unawareness of several important things, not everything is working properly. My system is a Lenovo Thinkpad X230 Sometimes when I shutdown I get error message from iwlwifi: It starts with a time out error about sending a power table and after several other errors it says "On demand firmware reload and "Unable to initialize device". And the shutdown stops there so I can only use hard shutdown. Also when I boot, I often boot to a black screen, but pressing Ctrl+Alt+F1 gets me to the l (HowTos)