While I did not experience this bug, another user did:
comment #6 on bug 1592833
The fonts are not updated very often in stable Ubuntu releases so maybe
you won't experience this bug again in Ubuntu 16.04 LTS.
** Changed in: fonts-cantarell (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1600160
Title:
upgrading package causes interface text to be replaced by squares
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