Ok, I solved the problem and thought it might help to share this, just in case anyone is hazzling with similar problems.  Sidenote: Digging a bit deeper in "the bond0-not-found"-problem in several other unRaid forum topics (and there a plenty of them!), it more or less always turned out, that there is something wrong with the USB-Stick (though I still do not get what causes a problem under 6.7 while it is working flawlessly under 6.6*).   Anyway, I deciced to do a fresh and clean ins
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