Found the problem and a solution. It works with and without the hide_slideshow option.
** Patch added: "gtk_ui.py.patch" https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1888451/+attachment/5797112/+files/gtk_ui.py.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1888451 Title: regression: ubiquity/hide_slideshow true; crashes installer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1888451/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs