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
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Update category headings should not be selectable
https://launchpad.net/bugs/85497
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