Hi Reiner, hellbrueck@web.de (Reiner Hellbrück) writes: > some time ago, I used org-drill with emacs27 and it worked fine. After a > fresh install of ubuntu, I changed to emacs26.3. When running 'M-x > org-drill' the following message appears: I suggest you try https://gitlab.com/phillord/org-drill/ with both Emacs 26.3 and Emacs 27, see what needs to be fixed in org-drill.el and contact its author directly if needed. org-drill.el is not part of Org or of Emacs, so I'm closing this report, but feel free to follow-up with goods news from the update upstream. Thanks, -- Bastien