[13:11] <Walex> runelind: that is probably created by a script in '/etc/motd.d/'
[13:12] <Walex> runelind: check output of 'apt-cache search motd'
[15:33] <runelind> Walex there was a kernel update available when I did an apt update this morning, and after the reboot the message went away.  At least for now!