3 new Fog servers running Ubuntu 16.04.4 LTS - Each built a few weeks back at 1.5.4

This older machine had been working on multiple previous versions including 1.5.2. I’ve tried multiple suggestions. Downgraded kernel to 4.15.2 as well

Since it was working in previous versions I copied the kernel and init to the 1.5.4 server and named them OldPC and OldPC.xz and directed the host to use them. I was able to get past this error but then encountered “Attempting to check in… Failed”.

Hoping this is the last year I have to support these older machines and can get by with my old Fog server so worries if not a simple solution.

Thank you!

Recently built from scratch new Fog 1.5.4 servers on Ubuntu 16.04 LTS using new hardware. Have the identical issue on identical hosts. I thought I made progress by copying both the kernel and init files from 1.4.3 (named them OldPC and OldPC.xz) and have the host using these. I got past the Kernel Panic but the client “Attempting to check in… Failed”.
I’m able to still image off the old 1.4.3 server so not a big issue for me but I still have a few hundred DC5800 machines I’ll need to support for awhile. I did copy and try OldPC32 and OldPC32.xz as well along with the other suggestions in this thread.

Newer PCs work great. Thanks for any suggestions.