I'm following a GPU passthrough guide online which requires me to add "pci-stub" to /etc/initramfs-tools/modules. But it doesn't exist. I'm using OpenSUSE Tumbleweed.
In OpenSUSE the process is a bit different.
You need to open
/etc/sysconfig/kernel for editing and than locate the line below starting with:
which you need to edit and add the module you want to install.
After this you need to run
mkinitrd that is equivalent to
update-initramfs in Debian like distros.
PS: I never done this before so be careful