Comment 21 for bug 1313784

Glad I found this bugreport. The message got me worried, and I can imagine it will keep on creating the same thought with many more people until it (finally!) gets suppressed.
Just got this on 20.04 today while running apt autoremove:

Generating grub configuration file ...
Found linux image: /boot/vmlinuz-5.4.0-54-generic
Found initrd image: /boot/initrd.img-5.4.0-54-generic
Found linux image: /boot/vmlinuz-5.4.0-53-generic
Found initrd image: /boot/initrd.img-5.4.0-53-generic
File descriptor 10 (/var/lib/dpkg/triggers/linux-update-5.4.0-48-generic (deleted)) leaked on lvs invocation. Parent PID 55702: /bin/sh
done