update-grub, dual boot, не видит Вынь - logger: socket /dev/log: Connection refused???

sudo mount /dev/sdb1 /mnt
sudo mount --bind /dev /mnt/dev
sudo mount --bind /proc /mnt/proc
sudo mount --bind /sys  /mnt/sys
sudo chroot /mnt
grub-install /dev/sdb

update-grub2

root@ubuntu:/home/ubuntu# lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
fd0      2:0    1     4K  0 disk 
loop0    7:0    0   1.3G  1 loop /rofs
sda      8:0    0 186.3G  0 disk 
├─sda1   8:1    0  10.5G  0 part 
├─sda2   8:2    0     1K  0 part 
├─sda5   8:5    0  29.3G  0 part 
├─sda6   8:6    0  48.8G  0 part 
├─sda7   8:7    0  48.8G  0 part 
└─sda8   8:8    0  48.8G  0 part 
sdb      8:16   0 149.1G  0 disk 
├─sdb1   8:17   0  70.3G  0 part 
└─sdb2   8:18   0     4G  0 part [SWAP]
sdc      8:32   0 149.1G  0 disk 
sdd      8:48   1    30G  0 disk 
├─sdd1   8:49   1    30G  0 part /media/ubuntu/flash
├─sdd2   8:50   1  31.5K  0 part 
└─sdd4   8:52   1   1.4G  0 part /cdrom
root@ubuntu:/home/ubuntu# sudo mount /dev/sdb1 /mnt
root@ubuntu:/home/ubuntu# sudo mount --bind /dev /mnt/dev
root@ubuntu:/home/ubuntu# sudo mount --bind /proc /mnt/proc
root@ubuntu:/home/ubuntu# sudo mount --bind /sys  /mnt/sys
root@ubuntu:/home/ubuntu# sudo chroot /mnt
root@ubuntu:/# grub-install /dev/sdb
Installing for i386-pc platform.
Installation finished. No error reported.
root@ubuntu:/# update-grub2
Generating grub configuration file ...
Found background image: /usr/share/images/desktop-base/desktop-grub.png
Found linux image: /boot/vmlinuz-4.9.0-6-amd64
Found initrd image: /boot/initrd.img-4.9.0-6-amd64
Found linux image: /boot/vmlinuz-4.9.0-5-amd64
Found initrd image: /boot/initrd.img-4.9.0-5-amd64
logger: socket /dev/log: Connection refused
logger: socket /dev/log: Connection refused
logger: socket /dev/log: Connection refused
logger: socket /dev/log: Connection refused
logger: socket /dev/log: Connection refused
logger: socket /dev/log: Connection refused
logger: socket /dev/log: Connection refused
logger: socket /dev/log: Connection refused
logger: socket /dev/log: Connection refused
logger: socket /dev/log: Connection refused
logger: socket /dev/log: Connection refused
logger: socket /dev/log: Connection refused
logger: socket /dev/log: Connection refused
logger: socket /dev/log: Connection refused
logger: socket /dev/log: Connection refused
logger: socket /dev/log: Connection refused
done