- deactivate windows 11 fast boot https://www.dedoimedo.com/computers/windows-11-fast-startup-disable.html
- in the BIOS, configure the linux hard drive to be the first boot order
- install os-prober :
sudo apt install os-prober sudo fdisk -lto check that the other drive with Windows 11 is detected- edit
/etc/default/grubto have those lines :
GRUB_DISABLE_OS_PROBER=false
GRUB_TIMEOUT_STYLE=menu
GRUB_TIMEOUT=10