If you use really old hardware with an old bios with early generation x86 serial console redirection, it might be sufficiently broken to not allow grub to take over the serial console with linux starts booting. The result? grub hangs with the "stage2 loading" message ...
Solution: Disable the bios console redirection; it probably sucks anyway. The only case I can think of where you would want it would be if you net boot with PXE and need to configure that.
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