You need to make the newly installed system bootable, by installing the GRUB boot loader on a bootable device. The usual way to do this is to install GRUB to your primary drive (UEFI partition/boot record). You may instead install GRUB to a different drive (or partition), or to removable media.
Ilaq ad terreḍ anagraw n usekker yettusbedden d amaynut, s usebded n usalay n usenker GRUB deg yibenk n usekker. Akken i tuɣeḍ tannumi txeddmeḍ-t, asebded n GRUB ɣef yibenk-inek·inem agejdan (aḥric UEFI/asekles n usenker). Tzemreḍ ad tesbeddeḍ deg wadeg-is GRUB ɣef umeɣri-nniḍen (neɣ aḥric), neɣ ɣef amidyat aziraz.