@PeterT
Many thanks for this information Peter,
Should I assume that the problem will not be resolved before that Kobo changes the rendering engine?
@David
You're right David, it is not too frequent, but I guess this is my favorite bug
@ Lucas
You can use Sigil with Ubuntu through wine (32b dependancies) or have a look here:
https://www.mobileread.com/forums/sho...d.php?t=211754
I dont know for Ubuntu, but it works very well with LMDE (64b)