Probably in connection with some version of yumex, I have somehow
gotten both */fc26.i686 and */fc26.x86_64 forms of a dozen or so rpms for
compiz.
This has not been a problem till now. fc26 (and, unless I'm
misremembering, fc25 and fc24 before that) has just ignored the
superfluous ones. But now system-upgrade is choking on the ones for fc27.
The machine is actually .x86_64, as I have now discovered. I
tried adding --allowerasing and --allowerasing --best, but with no
success.
Do I dare do something like "dnf remove compiz"?? (Or perhaps
"dnf remove */compiz/*/.i686 ???)