Comment # 3 on bug 1057007 from Marius Tomaschewski

No logs, config or anything useful in this report. See also:

https://en.opensuse.org/openSUSE:Bugreport_wicked

In this case:

abraxas:~ # cat /etc/os-release 
NAME="openSUSE Tumbleweed"
# VERSION="20170911"
ID=opensuse
ID_LIKE="suse"
VERSION_ID="20170911"
abraxas:~ # cat /etc/hostname
abraxas:~ # grep DHCLIENT_SET_HOSTNAME=  /etc/sysconfig/network/{dhcp,ifcfg-*}
/etc/sysconfig/network/dhcp:DHCLIENT_SET_HOSTNAME="yes"
abraxas:~ # wicked show-config | grep hostname
    <update>default-route,hostname,dns,nis,ntp,smb,nds,mtu,tz,boot</update>

abraxas:~ # dmesg | grep hostname
[    3.330264] systemd[1]: No hostname configured.
[    3.330269] systemd[1]: Set hostname to <localhost>.

-> works

obviously some configuration not permitting to update it -> invalid.