Jessie live installer does not install os-prober, despite being recommended by grub-common

gistfile1.txt

Jan  9 12:24:12 main-menu[342]: INFO: Menu item 'grub-installer' selected
Jan  9 12:24:12 grub-installer: info: architecture: amd64/generic
Jan  9 12:24:12 /bin/in-target: warning: /target/etc/mtab won't be updated since it is a symlink.
Jan  9 12:24:12 in-target: Reading package lists...
Jan  9 12:24:12 in-target: 
Jan  9 12:24:12 in-target: Building dependency tree...
Jan  9 12:24:12 in-target: 
Jan  9 12:24:12 in-target: Reading state information...
Jan  9 12:24:12 in-target: 
Jan  9 12:24:12 in-target: Suggested packages:
Jan  9 12:24:12 in-target:   multiboot-doc grub-emu xorriso
Jan  9 12:24:12 in-target: Recommended packages:
Jan  9 12:24:12 in-target:   os-prober
Jan  9 12:24:12 in-target: The following NEW packages will be installed:
Jan  9 12:24:12 in-target:   grub-common
Jan  9 12:24:13 kernel: [  268.232138] ISO 9660 Extensions: Microsoft Joliet Level 3
Jan  9 12:24:13 kernel: [  268.232582] ISO 9660 Extensions: RRIP_1991A
Jan  9 12:24:13 in-target: 0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Jan  9 12:24:13 in-target: Need to get 0 B/2,720 kB of archives.
Jan  9 12:24:13 in-target: After this operation, 15.0 MB of additional disk space will be used.
Jan  9 12:24:13 in-target: Selecting previously unselected package grub-common.^M