Upgrade Leap 15.6 to Slowroll: EFI boot <> GRUB2 BLS boot

English Install/Boot/Login
1

Hello

I’m trying to upgrade Leap 15.6 to Slowroll.
It’s a dual-boot machine with Windows.
The final screen of the installer displays the following warning:

“Cannot upgrade the bootloader because of a mismatch in boot technology. The upgraded system uses EFI boot, while the installation medium was booted using GRUB2 with BLS boot.
This scenario is not supported; the upgraded system may not boot, or the upgrade process may fail later.”

However, when I select Grub2 EFI under “Booting,” the system seems to accept this.

Is this safe, or will it cause problems later?

Thanks.

grub2_bls
grub2_bls1600×677 295 KB

grub2_efi
grub2_efi1089×912 142 KB

2

i don’t know how to proceed in your situtaion but why not try openSUSE migration tool

3

Grub2 EFI works just fine under Slowroll. And as a matter of fact I prefer it to GRUB2 BLS.

1 Like
4

GRUB2-BLS does not work with dual booting so that is not an option in your case.
For a 15.6 system using GRUB2-EFI I would keep the -EFI bootloader for the upgraded system. If you really don’t like it you can change that later, but it isn’t a trivial procedure (see for instance systemd-boot installation).
Choosing GRUB2-EFI is “safe”; I cannot tell whether or not there will be “problems later” since I never upgraded Leap 15.6 to Slowroll but upgrade of 15.6 to Tumbleweed is a routine openQA test, so that might depend on how “standard” your Leap 15.6 install is.
For instance, I would disable all non-default repositories and do a full update (for instance by zypper dup --allow-vendor-change) before the upgrade.

5

Thanks for all the replies.

So can I just select "GRUB2 EFI "in the installer and ignore the warning "This scenario is not supported; the upgraded system may not boot, or the upgrade process may fail later.
ERROR No proposal”?

If that’s the case, I’m wondering why the installer doesn’t suggest that itself (“No proposal”).

I’ve already upgraded two other Leap 15.6 laptops to Slowroll (without EFI) using the same USB flash drive.
That worked without any issues, so I’d like to stick with that method if possible.

6

The default option for your install medium is GRUB2-BLS but migration from GRUB2-EFI is not supported, hence the error message (the installer will not try to install GRUB2-BLS and the system might not boot, or boot a leftover 15.6 kernel if still there).
Choosing GRUB2-EFI as option enables a suitable migration path and no error is issued.

Does “without EFI” mean “legacy laptop with no UEFI system at all”? If that is the case the installer boots in “Legacy mode” and in that mode only GRUB2 boot option is available (not even GRUB2-EFI) and systems are upgraded keeping their old boot mode.

7

Thanks, I’ll try switching to GRUB2-EFI in the installer.

In any case, Leap 15.6 boots there with GRUB2 without EFI.
These are very old machines that wouldn’t work with Leap 16 (no x86_64-v2).

8

That worked great.
It’s just a bit unfortunate that the installer displays such an alarming warning instead of simply suggesting Grub2 EFI.
Thanks for the help.

9

This topic was automatically closed 7 days after the last reply. New replies are no longer allowed.