/usr/share/system-config-printer/ui/ is in system-config-printer-gnome 1.5.7+20160212-0ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/system-config-printer/ui/AboutDialog.ui
/usr/share/system-config-printer/ui/ConnectDialog.ui
/usr/share/system-config-printer/ui/ConnectingDialog.ui
/usr/share/system-config-printer/ui/InstallDialog.ui
/usr/share/system-config-printer/ui/JobsWindow.ui
/usr/share/system-config-printer/ui/NewPrinterName.ui
/usr/share/system-config-printer/ui/NewPrinterWindow.ui
/usr/share/system-config-printer/ui/PrinterPropertiesDialog.ui
/usr/share/system-config-printer/ui/PrintersWindow.ui
/usr/share/system-config-printer/ui/SMBBrowseDialog.ui
/usr/share/system-config-printer/ui/ServerSettingsDialog.ui
/usr/share/system-config-printer/ui/WaitWindow.ui
/usr/share/system-config-printer/ui/statusicon_popupmenu.ui