if someone can reproduce the error it would be useful to install libgtk-3-0-dbgsym and start ubiquity under gdb with --sync and "b gdk_x_error" to get a backtrace of the xerror, see https://stackoverflow.com/questions/30078005/how-to-break-on-gdk-x-error-using-gdb
if someone can reproduce the error it would be useful to install libgtk-3-0-dbgsym and start ubiquity under gdb with --sync and "b gdk_x_error" to get a backtrace of the xerror, see https:/ /stackoverflow. com/questions/ 30078005/ how-to- break-on- gdk-x-error- using-gdb