A bug I cannot reproduce now but it happened twice: after first run and all those configuration questions, program set the LDraw path to $HOME/.local/share/LPub3D Software/LPub3D/ldraw directory which it created but left empty. Then it was a surprise why LPub3D looks working somehow but I see empty pages, only a box with numbers of each part amount was there, no pictures. After long debugging I found it was just a matter of this misconfiguration.
But, as I wrote above, I'm not able to reproduce this behavior now, I forgot that combination of my options which caused this.
But, as I wrote above, I'm not able to reproduce this behavior now, I forgot that combination of my options which caused this.