I am/was affected by this bug (or at least the same symptoms) on a Dell XPS 13 9343. It got resolved by updating the BIOS from version A15 to version A20. I got the idea from reading the comments at https://bugs.launchpad.net/ubuntu/+source/grub2-signed/+bug/1753518, which may be related to this.
I am/was affected by this bug (or at least the same symptoms) on a Dell XPS 13 9343. It got resolved by updating the BIOS from version A15 to version A20. I got the idea from reading the comments at https:/ /bugs.launchpad .net/ubuntu/ +source/ grub2-signed/ +bug/1753518, which may be related to this.