>>>>> On Wed, 4 Dec 2019 09:40:45 +0000, Frank Morawietz 
>>>>> <frank.morawi...@merckgroup.com> said:

    > So it looks like the UEFI tftp connection refused error happened where 
ldlinux should be transferred.

    > Is there anything else I could examine to diagnose further?
I had problems with my thinkpad in the past when booting UEFI. First I
needed the newest syslinux binary, in those days I was still running
stretch. Then, my thinkpad T480 needs a long time and shows several
transmision error (currently I  cannot say which exact messages) when
doing UEFI boot. But after multiple error message it succeeds to boot.

-- 
regards Thomas

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