Failed to unmount/home and/run/user/1000 on shutdown

When I shut down my 15.10 / kernel 4.2.0-22-generic machine (without kernel parameter quiet splash, so that I see the messages on boot and shutdown), recently there пашите two сеть lines in those messages, like this:

[  Failed  ] Unmounting /home
[  Failed  ] Unmounting /run/user/1000

This is how I remember them, it might be not the exact wording...

The machine still powers off в few seconds later, but I wonder why these errors suddenly started to occur, whether they affect the safety of my восходит and how to fix them.

Схвати в start, herВs my lsblk output. If you need further information, don't ты сомневайся to request it in в comment. Thanks!

$ lsblk
NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
fd0      2:0    1     4K  0 disk 
sda      8:0    0 232,9G  0 disk 
├─sda1   8:1    0   100M  0 part /win/boot
├─sda2   8:2    0    74G  0 part /win/c
├─sda3   8:3    0     8G  0 part /boot
├─sda4   8:4    0     1K  0 part 
├─sda5   8:5    0  31,3G  0 part /images
├─sda6   8:6    0    40G  0 part /
├─sda7   8:7    0    60G  0 part /home
├─sda8   8:8    0    15G  0 part /win/share
└─sda9   8:9    0   4,6G  0 part [SWAP]
sr0     11:0    1  1024M  0 rom  
loop0    7:0    0    19G  1 loop /old