In order to mix different sound channels, the Asterisk MeetMe-extension relies on the dahdi-Module that take care of the necessary timing. This module is not a stock module in Ubuntu, so it has to be build from stock. Fortunately, Ubuntu delivers packages that take care of the framework used to build that module from source. The following line will install all those packages:
aptitude install asterisk-dahdi
Now, the dahdi module needs compilation. :
aptitude install linux-headers-3.0.0-12-virtual
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