Ubuntu
grub2 package

  1. Bug #1788727
  2. Comment #4

Comment 4 for bug 1788727

Revision history for this message
Bruno Cornec (bruno-cornec) wrote :

I had the same issue whn upgrading from 17.10 to 18.04 and used the following workaround:

cd /boot
mkdir unsigned
mv vmlinuz-4.10.0-40-generic vmlinuz-4.10.0-42-generic vmlinuz-4.13.0-46-generic unsigned/
apt-get upgrade

and voila problem solved :-)

It seems that unsigned kernels are left in the /boot directory (not used it seems) which prevents the grub update mechanism to happen correctly. So I think the "design" is wrong and that unsigned kernel in SB mode should just be ignored and shouldn't prevent the postinstall to proceed.

Just my 0.02€ and YMMV of course