Comment 21 for bug 570542

Examining the contents of the debs, the module is available in the latest Lucid, Maverick, Natty, and Oneiric -virtual kernel flavors.

Lucid:
$ dpkg -c linux-image-2.6.32-34-virtual_2.6.32-34.77_amd64.deb | grep "ahci"
-rw-r--r-- root/root 79400 2011-09-13 17:03 ./lib/modules/2.6.32-34-server/kernel/drivers/ata/ahci.ko

Maverick:
$ dpkg -c linux-image-2.6.35-30-virtual_2.6.35-30.60_amd64.deb | grep "ahci"
-rw-r--r-- root/root 54680 2011-09-19 15:07 ./lib/modules/2.6.35-30-virtual/kernel/drivers/ata/ahci.ko

Natty:
$ dpkg -c linux-image-2.6.38-11-virtual_2.6.38-11.50_amd64.deb | grep "ahci"
-rw-r--r-- root/root 50688 2011-09-12 15:51 ./lib/modules/2.6.38-11-virtual/kernel/drivers/ata/ahci.ko

Oneiric:
$ dpkg -c /var/cache/apt/archives/linux-image-3.0.0-12-virtual_3.0.0-12.20_amd64.deb | grep "ahci"
-rw-r--r-- root/root 51504 2011-10-07 14:53 ./lib/modules/3.0.0-12-virtual/kernel/drivers/ata/ahci.ko