[SOLVED] Seagate disks no longer automounting after upgrading to Linux 4.14.24+

[Nachteule]

Ehm, what in hell happened with your Pi????

The output of /proc/cpuinfo should be somthing like that:

Hardware : BCM2835
Revision : a02082
Serial : 0000000012345678

I suppose your dtb files in /boot folder are missing, broken or doesn't fit to your running kernel - in other words:
your /boot folder seems to be broken

if xbian-arch reports garbage, kernel can not be installed correctly and a lot of scripts may not work

So we are back to my previous posts: please check your boot partition (/boot) and post output

df /boot

and

ls -la /boot