In order to start your new system, a so called boot loader is used.  It is installed in a boot partition.  You must set the bootable flag for the partition.  Such a partition will be marked with "${BOOTABLE}" in the main partitioning menu.
I wakken ad tesnekreḍ anagraw-inek·inem amaynut, ad yettuseqdec ayen yettusemman s usalay n usenker. Yettusebded ɣef uḥric n usenker. Ilaq ad tesbaduḍ anay n usekker i uḥric. Aḥric am wa ad yettucreḍ s "${BOOTABLE}" deg wumuɣ n beṭṭu agejdan.