hangs at Building initial module for 4.15.0-23-generic (promptless password prompt)

[Andrew McLeod]

This bug may more specifically be with dkms, but assume most people will hit it this way

sudo apt-get update ; sudo apt-get upgrade would hang at:

Building initial module for 4.15.0-23-generic

after a few seconds, keypresses/enter were not being registered, but there is a secret password prompt - i.e., at this point, when things appear to have hung, entering your password twice will continue the process. It may also be related to 'secure boot' but I am unsure.

Similar issue and resolution found here:

https://github.com/teejee2008/ukuu/issues/81

[Andrew McLeod (admcleod)]

Further info: I am running bionic, upgraded from xenial -> zesty -> bionic, and have done previous apt-get upgrade's in bionic without running into this issue.