Yes, that's the expected "resolution", and what we try to do via
evolution --force-shutdown but perhaps unsuccessfully.

I re-ran the upgrade on metal and managed to get the error that is the
most likely cause of the unreadable text (in any application, since any
already-running application runs the risk of showing unreadable
dialogs):

(evolution-alarm-notify:1708): Pango-CRITICAL **: No modules found:
No builtin or dynamically loaded modules were found.
PangoFc will not work correctly.
This probably means there was an error in the creation of:
  '/etc/pango/pango.modules'
You should create this file by running:
  pango-querymodules > '/etc/pango/pango.modules'

(evolution-alarm-notify:1708): Pango-WARNING **: failed to choose a
font, expect ugly output. engine-type='PangoRenderFc', script='latin'

(evolution-alarm-notify:1708): Pango-WARNING **: failed to choose a
font, expect ugly output. engine-type='PangoRenderFc', script='common'

Indeed, libpango1.0-common happily removes /etc/pango/pango.modules
after the upgrade:

libpango1.0-common.postinst:# until version 1.14.5-1, we generated a 
/etc/pango/pango.modules
libpango1.0-common.postinst:    echo "I: Purging /etc/pango/pango.modules" >&2
libpango1.0-common.postinst:    rm -f /etc/pango/pango.modules

** Package changed: evolution (Ubuntu) => pango1.0 (Ubuntu)

** Changed in: pango1.0 (Ubuntu)
     Assignee: (unassigned) => Mathieu Trudel-Lapierre (mathieu-tl)

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https://bugs.launchpad.net/bugs/1038573

Title:
  Unreadable messages displayed during Lucid -> Precise upgrade

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