When i start my start my laptop I see a line from 5 or 6 days ..Line is 'Failed to start load kernel module'..Is this serous problem and how to solve this problem?
Well, serious... I would say not really. Some kernel module is not loaded properly. To find out which one it is you might try the following commands and post their output:
sudo systemctl status systemd-modules-load.service
sudo journalctl -u systemd-modules-load.service
sudo /usr/lib/systemd/systemd-modules-load
Here was somebody else having this problem, so searching the forum can be a good idea sometimes 
:
An example of how the investigation of "kernel modules failed" issues should be done presented at the following link.
Follow the steps.
https://wiki.archlinux.org/index.php/Systemd#Investigating_systemd_errors
this is output of first command
second
third
Look here, same output:
