Your installation media couldn't be mounted. When installing from CD-ROM, this probably means that the disk was not in the drive. If so you can insert it and try again.
Amidya-inek·inem n usebded yegguma ad yettuserkeb. Ma yella tsebdadeḍ seg CD-ROM, yezmer d aḍebsi i ulac deg yibenk. Ihi ma yella d aya, tzemreḍ ad t-terreḍ syen ɛreḍ tikkelt-nniḍen.