Created attachment 1085490 [details] grub.cfg Description of problem: My Thinkpad has a GPT partition with EFI boot. Ubuntu 14.04 is installed already. When Fedora 23 is installed, the /boot/efi/EFI/fedora/grub.cfg contains the following Fedora section ### BEGIN /etc/grub.d/10_linux ### menuentry 'Fedora (4.2.3-300.fc23.x86_64) 23 (Workstation Edition)' --class fedora --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-4.2.3-300.fc23.x86_64-advanced-3f8c2975-7488-48d8-beba-28783d1d3a4b' { load_video set gfxpayload=keep insmod gzio insmod part_gpt insmod ext2 set root='hd0,gpt2' if [ x$feature_platform_search_hint = xy ]; then search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 cbd3e2ce-b1c1-41e4-8e46-36d782a3cfe7 else search --no-floppy --fs-uuid --set=root cbd3e2ce-b1c1-41e4-8e46-36d782a3cfe7 fi linuxefi /vmlinuz-4.2.3-300.fc23.x86_64 root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/root rhgb quiet LANG=en_US.UTF-8 initrdefi /initramfs-4.2.3-300.fc23.x86_64.img } menuentry 'Fedora (0-rescue-f4b775897bad42759168ad5d683202cb) 23 (Workstation Edition)' --class fedora --class gnu-linux --class gnu --class os --unrestricted $menuentry_id_option 'gnulinux-0-rescue-f4b775897bad42759168ad5d683202cb-advanced-3f8c2975-7488-48d8-beba-28783d1d3a4b' { load_video insmod gzio insmod part_gpt insmod ext2 set root='hd0,gpt2' if [ x$feature_platform_search_hint = xy ]; then search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt2 --hint-efi=hd0,gpt2 --hint-baremetal=ahci0,gpt2 cbd3e2ce-b1c1-41e4-8e46-36d782a3cfe7 else search --no-floppy --fs-uuid --set=root cbd3e2ce-b1c1-41e4-8e46-36d782a3cfe7 fi linuxefi /vmlinuz-0-rescue-f4b775897bad42759168ad5d683202cb root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/root rhgb quiet initrdefi /initramfs-0-rescue-f4b775897bad42759168ad5d683202cb.img } and the following Ubuntu section ### BEGIN /etc/grub.d/30_os-prober ### menuentry 'Ubuntu 14.04.3 LTS (14.04) (on /dev/sda5)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-simple-892d1d33-94b8-4280-a529-1cc9e2ee4d91' { insmod part_gpt insmod ext2 set root='hd0,gpt5' if [ x$feature_platform_search_hint = xy ]; then search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt5 --hint-efi=hd0,gpt5 --hint-baremetal=ahci0,gpt5 892d1d33-94b8-4280-a529-1cc9e2ee4d91 else search --no-floppy --fs-uuid --set=root 892d1d33-94b8-4280-a529-1cc9e2ee4d91 fi linux /boot/vmlinuz-4.1.10-040110-generic root=UUID=892d1d33-94b8-4280-a529-1cc9e2ee4d91 ro quiet splash $vt_handoff initrd /boot/initrd.img-4.1.10-040110-generic } submenu 'Advanced options for Ubuntu 14.04.3 LTS (14.04) (on /dev/sda5)' $menuentry_id_option 'osprober-gnulinux-advanced-892d1d33-94b8-4280-a529-1cc9e2ee4d91' { menuentry 'Ubuntu (on /dev/sda5)' --class gnu-linux --class gnu --class os $menuentry_id_option 'osprober-gnulinux-/boot/vmlinuz-4.1.10-040110-generic--892d1d33-94b8-4280-a529-1cc9e2ee4d91' { insmod part_gpt insmod ext2 set root='hd0,gpt5' if [ x$feature_platform_search_hint = xy ]; then search --no-floppy --fs-uuid --set=root --hint-bios=hd0,gpt5 --hint-efi=hd0,gpt5 --hint-baremetal=ahci0,gpt5 892d1d33-94b8-4280-a529-1cc9e2ee4d91 else search --no-floppy --fs-uuid --set=root 892d1d33-94b8-4280-a529-1cc9e2ee4d91 fi linux /boot/vmlinuz-4.1.10-040110-generic root=UUID=892d1d33-94b8-4280-a529-1cc9e2ee4d91 ro quiet splash $vt_handoff initrd /boot/initrd.img-4.1.10-040110-generic } as can be seen the "linux" and "initrd" commands in the Ubuntu sections should be "linuxefi" and "initrdefi". also to give a better idea, Ubuntu was first installed on an MBR partition which I later converted to GPT (much before the current Fedora install was attempted though). the current grub.cfg causes Ubuntu If I change the "initrd" and "linux" to "linuxefi" and "initrdefi", then it boots properly. Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info:
What does the Ubuntu grub.cfg look like?
It was already discussed in other bugs. os-prober doesn't tell Grub if it should use linux/initrd or linuxefi/initrdefi commands. An EFI grub is expected to create entries with linuxefi/initrdefi for any Linux based OSes it finds. So, in any case, I think this is a grub2 bug rather than os-prober's bug. Even if Ubuntu was installed in BIOS mode, an EFI grub should still used linuxefi/initrdefi commands. So the original installation mode is actually irrelevant, and therefore os-prober cannot/should not help in this case anyways! BTW, the same bug was already fixed in grub2 in previous Fedora releases, so maybe the patches are not applied to F23 grub2?
Relevant bugs: #1161749 (should os-prober provide more info?) and #1108296 (the fix I talked about).
Thanks, looks like the patch from bug 1108296 is still present, so I wonder if this is the CSM vs. UEFI case. The Ubuntu grub.cfg should tell us...
@brian - do you need any further info from me ?
I tried looking for any other grub.cfg, but I only have /boot/efi/EFI/fedora/grub.cfg now. I can boot into Ubuntu if I change initrd-> initrdefi, so let me know if I can pull some info by booting into Ubuntu.
Created attachment 1086232 [details] Ubuntu configs I booted to Ubuntu and pulled some of the configs. please note grub.cfg was at /boot/grub/grub.cfg
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