cdrom and press enter code example
Example: Media change: please insert the disc labeled'Ubuntu 20.04.1 LTS _Focal Fossa_ - Release amd64 (20200731)'in the drive '/media/cdrom/' and press [Enter]
media change: please insert the disc labeled
'Ubuntu 12.04.3 LTS _Precise Pangolin_ - Release amd64 (20130820.1)
in the drive '/media/cdrom/' and press enter