disco: I reproduced the bug by installing linux headers -17-generic which hang and then upgrading dkms to 2.6.1-4ubuntu2.1 and installing linux-headers -16-generic (purging and reinstalling the 17 headers did nothing it seems, so, don't care ..) which had a working prompt.
To "revoke" the key, run mokutil --revoke-import after a fresh setup and install of the module, before installing the header package.
disco: I reproduced the bug by installing linux headers -17-generic which hang and then upgrading dkms to 2.6.1-4ubuntu2.1 and installing linux-headers -16-generic (purging and reinstalling the 17 headers did nothing it seems, so, don't care ..) which had a working prompt.
To "revoke" the key, run mokutil --revoke-import after a fresh setup and install of the module, before installing the header package.