I triggered this situation when trying to install a proprietary NVIDIA driver. 
This driver cannot be loaded into the kernel. First must its key being 
registered in the bios. During install of the driver I'm asked to switch off 
UEFI secure boot and then reboot. On reboot a blue screen appears with MOK 
management. The process is failing, the driver is not installed correctly and 
also brings this problem with "Booting in insecure mode".
As I understand there is a fix for this problem in Ubuntu Trusty.
I have 14.04 Trusty and still seem to have this problem

#get --installed list | grep shim     Tells me:

shim/trusty-updates,now 0.8-0ubuntu2 amd64 [installed,automatic]
shim-signed/trusty-updates,now 1.17~14.04.1+0.8-0ubuntu2 amd64 [installed]
systemd-shim/trusty,now 6-2bzr1 amd64 [installed,automatic]

so > 0.7
Do I have the fixed version? And what must I do to let the change have effect?
Thanks in advance.

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https://bugs.launchpad.net/bugs/1384973

Title:
  shim prints "Booting in insecure mode" when booting without SecureBoot
  enabled

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