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Extra configuration for Evince
xdg-open works, but Evince still refuses to open point
and click links due to denied permissions, you might need to
change the Apparmor profile of Evince which controls the kind of
actions Evince is allowed to perform.
For Ubuntu, the process is to edit the file /etc/apparmor.d/local/usr.bin.evince and append the following lines:
# For Textedit links /usr/local/bin/lilypond-invoke-editor Cx -> sanitized_helper,
After adding these lines, call
sudo apparmor_parser -r -T -W /etc/apparmor.d/usr.bin.evince
Now Evince should be able to open point and click links. It is likely that similar configurations will work for other viewers.