Public bug reported: Fresh installation of Ubuntu 26.04, fully up-to-date.
As discussed here: https://discourse.ubuntu.com/t/84315 and presenting this bug report as requested by @ogra (Oliver Grawert) here: https://discourse.ubuntu.com/t/84315/6 --- SUMMARY After installing Ubuntu 26.04, I checked that everything was working (including being able to reboot). Normally, I change Grub to show the menu on boot, as I always do on a fresh installation. I didn't realise that Ubuntu 26.04 has completely changed the booting and Grub mechanisms, so I used the same method as on previous releases. Apparently, the system (specifically update-grub) should have refused to try to implement my change, but instead it broke the system without the ability to restore it. --- HOW TO REPLICATE 1. Create a file /etc/default/grub.d/grubmenu.cfg (the name isn't important) with the following lines: GRUB_TIMEOUT_STYLE=menu GRUB_TIMEOUT=8 2. Run sudo update-grub 3. Reboot --- RESULTS • The Grub menu displays only one option, specifically "UEFI Firmware Settings". As expected, this option takes you to the BIOS settings. • If you interrupt the boot sequence with the Esc key, you get the new 26.04 Grub options. However, "Continue to run mode" takes you to the previous step. • There appears to be no way to restore the system to working order; I couldn't figure it out. I tried running the restore option, but it didn't work for me. • I have retried this with reliably repeatable results. --- SYSTEM $ lsb_release --all No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 26.04 LTS Release: 26.04 Codename: resolute • Fresh installation of Ubuntu 26.04, using TPM-backed full-disk encryption with EFI and Secure Boot enabled. I haven't enabled Pro. • This was done on VirtualBox (Host: Ubuntu 24.04), so it is in a VM. I have not tried this on bare metal for obvious reasons. ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: grub2-common 2.14-2ubuntu2 ProcVersionSignature: Ubuntu 7.0.0-22.22-generic 7.0.0 Uname: Linux 7.0.0-22-generic x86_64 ApportVersion: 2.34.0-0ubuntu2 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Sat Jun 20 14:50:54 2026 ProcEnviron: LANG=en_US.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=xterm-256color XDG_RUNTIME_DIR=<set> SourcePackage: grub2 UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: grub2 (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug resolute wayland-session -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2157702 Title: Amending Grub on 26.04 breaks boot, with no way to fix it To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/2157702/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
