dual boot: post install update causes the other Linux not to be listed anymore in grub

[tuxayo]

• install in a partition next to an non-encrypted existing linux install (encrypt Gecko in case that's a factor)
• first boot after install, I see also my other Linux in grub
• update the whole system (with the language change desktop launcher is case that's a factor)
• reboot
• only Gecko is in grub

iso: GeckoLinux_ROLLING_XFCE.x86_64-999.210526.0

[tuxayo]

The "Probe foreign OS" option in YaST->System->Boot Loader->Boot Loader Option is disabled.

Maybe having GRUB_DISABLE_OS_PROBER=false in /etc/default/grub on install would fix it?

[geckolinux]

Thank you for this report, you're right that the latest version of GRUB changed its behavior and no longer probes for other OS versions by default.

Maybe having GRUB_DISABLE_OS_PROBER=false in /etc/default/grub on install would fix it?

Yes exactly, this will be included in the upcoming updates to GeckoLinux.

[ghost]

I'm wondering if this is a problem with OpenSUSE as well or a GeckoLinux issue only?

[geckolinux]

It's an intentional change and feature regression in upstream GRUB due to (in my opinion) paranoid and unrealistic security concerns.

https://www.gnu.org/software/grub/manual/grub/html_node/Simple-configuration.html

GRUB_DISABLE_OS_PROBER

It is disabled by default since automatic and silent execution of os-prober, and creating boot entries based on that data, is a potential attack vector. Set this option to false to enable this feature in the grub-mkconfig command

https://wiki.archlinux.org/title/GRUB#Detecting_other_operating_systems

If you get the following output: Warning: os-prober will not be executed to detect other bootable partitions then edit /etc/default/grub and add/uncomment:

GRUB_DISABLE_OS_PROBER=false

[geckolinux]

Fix implemented in upcoming ROLLING and STATIC releases.