linux headers not found

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http://askubuntu.com – I upgraded to ubuntu 12.04 and the x server is not running anymore. It turned out to be the nvidia driver, so I installed nvidia-current. Doing this I got an error message telling me that linux sources are not available. uname -r reports: 2.6.32-34-generic-pae So I tried: sudo apt-get install linux-headers- But this package does not exist (anymore?) Can anybody help me to get the required sources? (HowTos)