The second is good. SD, if present, otherwise USB.
How do I check/change the boot flag?
Use something like the "Disks" app or "gparted" or other partition manager. Check under "System Tools".
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This is headless, so not an option, but thanks.
Looks like Bogi has the good link.
That’s all the standard stuff, which I’ve done.
dmesg?
/var/log/messages?
lsusb?
