pekka@pekka-eneroc:~/Desktop$ sudo os-prober 
pekka@pekka-eneroc:~/Desktop$ lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sdb      8:16   0 149,1G  0 disk 
├─sdb2   8:18   0 140,7G  0 part /
├─sdb3   8:19   0   7,9G  0 part [SWAP]
└─sdb1   8:17   0   512M  0 part /boot/efi
sda      8:0    0 298,1G  0 disk 
├─sda4   8:4    0   106G  0 part /media/pekka/misc
├─sda2   8:2    0    20G  0 part 
├─sda3   8:3    0  87,6G  0 part 
└─sda1   8:1    0  64,8G  0 part