This isn't particularly a Slovenian thing; I just tried a Slovenian install and
it went fine. Please extract /var/log/partman from the installer (go back to the
main menu and select "Save debug logs", or "Shrani dnevnike za potrebe
razhroščevanja" in Slovenian, to get a choice of various ways to extract the
logs) and attach it here.
This isn't particularly a Slovenian thing; I just tried a Slovenian install and
it went fine. Please extract /var/log/partman from the installer (go back to the
main menu and select "Save debug logs", or "Shrani dnevnike za potrebe
razhroščevanja" in Slovenian, to get a choice of various ways to extract the
logs) and attach it here.