I used zenity to trigger the unescaped ampersand error, and could that way confirm that replacing & with & fixes the problem (see attached screenshot).
** Attachment added: "ampersand-error-zenity.png" https://bugs.launchpad.net/ubuntu-translations/+bug/1639743/+attachment/4775973/+files/ampersand-error-zenity.png -- You received this bug notification because you are a member of Ubuntu Translations Coordinators, which is subscribed to Ubuntu Translations. Matching subscriptions: Ubuntu Translations bug mail https://bugs.launchpad.net/bugs/1639743 Title: `&` in french translaction "Logiciels & mises à jour" should be escaped as `&` Status in Ubuntu Translations: Triaged Bug description: When running update-manager in French the "Logiciels & mises à jour" sentence make the update-manager to fail with an empty dialog. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-translations/+bug/1639743/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-translations-coordinators Post to : ubuntu-translations-coordinators@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-translations-coordinators More help : https://help.launchpad.net/ListHelp