Have confirmed looking at the apt-clone attachment that shim-signed was in state 'deinstall ok config-files' prior to the dist-upgrade. So this is not a bug in the upgrader per se; the thing to figure out is when and why shim-signed was removed prior to this.
Have confirmed looking at the apt-clone attachment that shim-signed was in state 'deinstall ok config-files' prior to the dist-upgrade. So this is not a bug in the upgrader per se; the thing to figure out is when and why shim-signed was removed prior to this.