Comment 4 for bug 494658

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Stefan Bader (smb) wrote : Re: [Bug 494658] Re: linux-headers-2.6.31-16-server; DRBD module can't be loaded; Unknown symbol cn_add_callback

My educated guess in this case would be that DKMS for whatever
reasons (yet to find out), compiled the -16 module with the -15
kernel headers.

You might try a

sudo dkms remove -m drbd8 -v 8.3.3 -k 2.6.31-16-server
sudo dkms build -m drbd8 -v 8.3.3 -k 2.6.31-16-server

to rebuild the module (probably check also whether the -16
version of linux-headers is installed). If that is successful,
then we have to see whether there are still upgrade logs around
for that failed update and whether this gives a clue what went
wrong.