Bug#1121934: cdrom: Target install partition fails to mount in EFI installer. Works in non-EFI installer
Hello, please find replies inline below.
On Friday, December 5th, 2025 at 8:12 PM, Pascal Hambourg <pascal@plouf.fr.eu.org> wrote:
>
>
> (Re-adding the bug address to the recipients, if others than Cyril and I
> are interested in this case)
>
> On 05/12/2025 at 12:16, daan.nusman wrote:
>
> > Unfortunately I cannot reproduce this anymore after the install in non-UEFI mode succeeded.
>
>
> Do you mean that you do not want to destroy your successful installation
> or all later installations in UEFI mode succeeded ?
The installations all succeeded, in non-UEFI and UEFI modes. I do not care about destroying / re-installing at this point in time.
> > > It looks like the EFI partition was not formatted properly.
>
>
> I identified a few use cases which may cause this failure and are
> dependent on the previous partitioning layout, that is why history
> matters. Do you remember which partitions the disk had before your first
> failed installation attempt in EFI mode ?
Oh geez :-) The order was roughly:
(Always using guided mode, and the entire disk).
* Had a Fedora install with LVM/crypt enabled.
* Installed Debian 13.2 with LVM/crypt + full random overwrite, successfully in non-UEFI mode.
(Here installing NVidia non-free drivers killed the OS login (KDE seems to crash immediately on login), switched to an old AMD GPU I had lying around. This failed right after the "Graphical Installation" option with a garbled screen. A Fedora dev told me that the "vga=788" in the boot parameters is suspect, but that it's the VESA BIOS of the AMD GPU that's to blame. Started using UEFI mode as this seemed to work with the AMD GPU, so:)
* Installed Debian 13.2 with LVM/crypt + not a full random overwrite (canceled it): the reported mount fail error occurred here. Suspected the cancel was to blame, so:
* Installed Debian 13.2 without LVM: also mount fail.
* Installed Debian 13.2 in non-UEFI mode, graphics fix, without LVM. This installed correctly.
After this I filed the bug report. But any attempts to reproduce the mount fail error did not work after that:
* Tried the UEFI mode, no LVM/crypt. This installed correctly.
* Tried the UEFI mode, LVM/crypt + full bit scramble of the drive. This installed correctly. I'm using this install now.
I hope this also answers your questions about what was done in what mode. Caveat: I cannot be entirely sure about the exact order of events.
I'm available if you want to try some stuff out, otherwise I'll just go on a use this install.
Kind regards,
Daan Nusman
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