I believe this is harmless, but not really know ;)
Attached part of bootlog file (journalctl -b), containing this error
** Attachment added: "boot-log-part"
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1728378/+attachment/5003784/+files/boot-log-part
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setxkbmap -print > xkbmap.txt
** Attachment added: "setxkbmap -print > xkbmap.txt"
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1421205/+attachment/4317966/+files/xkbmap.txt
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** Attachment added: "xkbcomp -xkb :0 - > xkbcomp.txt"
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1421205/+attachment/4317965/+files/xkbcomp.txt
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https://bugs.launchpad.net
Public bug reported:
Problem: Keyboard Volume up/down keys not work after installation
If I set in keyboard control panel another shortcut for volume up/down
(Ctrl+arrows) - this works right.
If I set in keyboard control panel volume up/down keys from my keyboard, this
assigned in control pane