Hi,
almost the same situation but with a mutiboot Ubuntu 25.10, Ubuntu 24.04,
Debian... and I still had problems.
I've modified /etc/apparmor.d/os-prober and /etc/default/grub and this
helped to avoid the "Permission denied" message running the update-grub.
Problem was that I still couldn't see the other operating systems on
grub menu.
Here's a summary of what I did.
1. Modified /etc/apparmor.d/os-prober adding the string:
file /usr/lib/cargo/bin/coreutils/** ix,
2. Make sure that /etc/default/grub is configured to detect other os and show
them in the boot menu:
GRUB_TIMEOUT_STYLE=menu
GRUB_TIMEOUT=10
GRUB_DISABLE_OS_PROBER=false
3. Restart apparmor:
sudo /etc/init.d/apparmor restart
4. Save this setup running:
sudo update-grub
...and I could see that the other os were detected, but when I rebooted the
system grub menu only showed the 25.10.
Did I forget something?
Another problem was that the EFI menu showed only the Ubuntu 25.10 entry.
I recovered grub performing a chroot in a live session so that now the "main"
system is Ubuntu 24.04.
Please let me know if there is anything I can do to help.
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https://bugs.launchpad.net/bugs/2122351
Title:
unshare: failed to execute /bin/true: Permission denied
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