Looking at the change in livecd-rootfs it seems to be indeed not related, as the modified code-path is only executed for ubuntu-cpc projects.
Writing down some of our thoughts. Me and Jean-Baptiste sat down on the issue just now and noticed a strange thing happening in the ESP. We had 3 installs: A) cosmic ubuntu-server (debian-installer), B) cosmic ubuntu-server-live (subiquity) system and C) bionic ubuntu. A) is obviously broken, we get the grub2 prompt after booting. All cases but A) work, but even for A) it's possible still to boot the system by directly loading the config from the main partition. We compared the ESP contents in A), B) and C). For B) the grub.cfg file (along with the .efi binaries) is located in the EFI/ubuntu/ directory on the efi partition. For C) there are 2 grub.cfg files present (and the corresponding binaries), one in EFI/ubuntu/ and one in EFI/grub/. Both of those systems boot. However, for A) the ESP only has the EFI/grub/ part. It looks like something that usually installed the required bits to ubuntu/ has changed and now, possibly, this is causing grub not proceeding with its boot process. Problem is we can't seem to see any changes in any of the installer packages that could have touched these parts. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1775743 Title: [regression] Cosmic daily images 20180606-11 install but boots only to grub prompt on EFI systems To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1775743/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
