Ok, I found the cause: I had the meta package linux-image-generic
installed, but not the metapackage linux-generic. For that reason, when
kernel was upgraded the package with the kernel headers wasn't upgraded,
and that caused the issue (that of course disappeared reverting to the
previous kernel
apport information
** Tags added: apport-collected
** Description changed:
After updating my kernel to linux-image-4.4.0-186-generic yesterday in
Ubuntu 16.04, the screen resolution dropped, because it stopped using
the nvidia drivers.
- After reverting back to
