On Thu, 2021-12-02 at 15:52 +0000, Tixy wrote: > On Thu, 2021-12-02 at 13:52 +0100, Christian Britz wrote: > > > > To be honest, I don't know exactly what the installer does, if it finds > > another OS. > > How would it do that? Detecting other OS's is what the os-prober > package is for. Answering my own question, the installer may contain and use os-prober without installing it to the target system. -- Tixy