I've attached a tarball of my Boot efivars as requested by Julian and the output of efibootmgr -v below.
This is from an affected Dell XPS 9343 machine BootCurrent: 0004 Timeout: 1 seconds BootOrder: 0004,0006 Boot0004* elementary OS 6 PciRoot(0x0)/Pci(0x1f,0x2)/Sata(3,65535,0)/HD(1,GPT,d20333f5-d8c1-4a44-af39-21ace0ec620d,0x1000,0x838f7)/File(\EFI\ubuntu\shimx64.efi) Boot0006* UEFI: SanDisk Extreme 0001 PciRoot(0x0)/Pci(0x14,0x0)/USB(12,0)/HD(1,MBR,0x38b1c112,0x6a4,0x1f40)..BO ** Attachment added: "dell-xps-9343-bootvars.tar" https://bugs.launchpad.net/ubuntu/+source/shim/+bug/1937115/+attachment/5516355/+files/dell-xps-9343-bootvars.tar -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1937115 Title: Unable to boot/install Impish daily in UEFI boot mode To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cd-boot-images-amd64/+bug/1937115/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs