Comment 3 for bug 2034986

This is a longstanding bug in our font stack. Things can go very bad when a font in use is upgraded.

See for instance https://launchpad.net/bugs/1600160

It's not been noticed more recently because the Ubuntu font hasn't been updated in a while. (And there is no longer an Ubuntu GNOME shipping the Cantarell font by default.)

What about this idea for a workaround: have the upgrader temporarily switch the UI font to a font that hasn't been changed since Jammy?