Thank you all for your help in this matter. Today I have point-and-click working as it should, with AppArmor apparently doing what it is supposed to do.
What made the difference was the following: The Usage Manual 4.1.1 says that the lines # For Textedit links /usr/local/bin/lilypond-invoke-editor Cx -> sanitized_helper, should be added to the file /etc/apparmor.d/local/usr.bin.evince . This file did not exist, although there are several other files in that directory, so I had created the file and put just the two lines above in it. Unfortunately, as I reported, point-and-click didn't work for me. With the difficulties I was having, yesterday I disabled AppArmor for Evince by adding a soft link to /etc/apparmor.d/usr.bin.evince in /etc/apparmor.d/disable/ . This is what made point-and-click work eventually for me yesterday. However, following your latest emails to the list on the topic, today I thought I would have another go. I deleted the disabling link, and ran 'sudo apparmor_parser -r -T -W /etc/apparmor.d/usr.bin.evince' again. I also ran 'sudo apparmor_parser -r -T -W /etc/apparmor.d/local/usr.bin.evince'. I don't know whether that needed to be done or not, but I found that it throws out a syntax error. So I copied the lines out of the second file and inserted them into the main usr.bin.evince file. I then deleted /etc/apparmor.d/local/usr.bin.evince . After I ran 'sudo apparmor_parser -r -T -W /etc/apparmor.d/usr.bin.evince'once more, I found that point-and-click works as it should. I don't pretend to understand what is going on here, but in summary it appears that if the additional lines are added to /etc/apparmor.d/usr.bin.evince rather than to /etc/apparmor.d/local/usr.bin.evince it all works. I should add that, in addition to the above, I have corrected the ownership of ~/.local/share/applications/mimeapps.list. (I don't know how this came to be owned by root: I have looked at my bash history, and I certainly had not run 'xdg-mime default lilypond-invoke-editor.desktop x-scheme-handler/textedit' with sudo.) The point-and-click facility will be very useful to me now that I have got to the point of correcting and tweaking a 150-page score and its associated parts. But without your helpful suggestions, I would never have got it working, so thanks again. David _______________________________________________ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user