By looking at your screenshots it does not seem like a font rendering
problem. It is actually a theming issue.
** Package changed: gtk+3.0 (Ubuntu) => ubuntu
** Changed in: ubuntu
Importance: Undecided => Medium
** Changed in: ubuntu
Status: New => Triaged
** Package changed: ubuntu =
Note that the selection color in the GtkListBox also looks wrong here.
** Attachment added: "gtkpopover2.png"
https://bugs.launchpad.net/ubuntu/+source/gtk+3.0/+bug/1347321/+attachment/4161295/+files/gtkpopover2.png
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** Attachment added: "gtkpopover1.png"
https://bugs.launchpad.net/ubuntu/+source/gtk+3.0/+bug/1347321/+attachment/4161294/+files/gtkpopover1.png
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https://bugs.launchpad.net/bugs/134732