Hi, thanks for respond and actions taken
By monday I'll be away from pc, then I'll check.
With atril till that situation, I had no problems with epub files. Coolreader demands qt5 and I'm fan of one type system, gtk or qt, just as I hate systemd and prefer sysvinit-like one.

Hello.
Trying to open epub with atril finishes with info "no support for epub+zip files"
Webkit2gtk installed, starting from console shows no additional infos.
Xreader, which I hoped could replace atril, reads only first sites of chapters.\
Could You help, please?