So my current headless ubuntu server LTS just hit EOL so I set out to build new one, on same hrdwr. Removed current M.2 (ubuntu) and separate internal 6TB HD (music).
Installed a new (spare) M.2 (well actually it had clonezilla of current setup, yes you know where this is headed). I installed latest ubuntu-24.04.2 server, clean install / reformat etc… on spare M.2. Then Installed roon, did a few odds and ends.
Wanted to look and my existing samba config and a few other disk ID’s/ mount info from orig setup. So, I Installed previous\original M.2 and HD, booted up and no go. Stuck on PXE over IPv4. Seriously. I didn’t do anything (at least to my knowledge, should have booted right up).
Did some mucking around trying to get this to go and now its stuck on “verifying shim sbat data failed security policy violation something has gone seriously wrong”.
I have current backups of everything, but still, what the hell.
So it looks like I’ll have to do a DB restore (been a very long time since I had to do that) and then get the music HD installed / mounted etc… I haven’t installed the music HD on the new install, its sorta just bare bones ubuntu and roon, haven’t connected to roon yet, but I’m sure there is FW and other stuff I’ll have to get config’d.
Anyway, thoughts on best course of action / what to tackle first? I’m hoping my music drive won’t need any “work” 
as it had all the security and groups setup or whatever, honestly, I don’t recall and will have to dig up my notes, oooy.