Cannot be done because of limitations in GTK+. Even the separator in the file chooser's places list are selectable. Some time ago I filled a bug about this in GNOME's bugzilla.
Left agligning could be done with some efforts. ** Changed in: update-manager (Ubuntu) Status: Unconfirmed => Confirmed ** Changed in: update-manager (Ubuntu) Assignee: (unassigned) => Sebastian Heinlein -- Update category headings should not be selectable https://launchpad.net/bugs/85497 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs