Thanks for the info. I am seeing messages like these in system log:

firefox_firefox.desktop[25117]: [25117, Main Thread] WARNING: GTK+ module 
/snap/firefox/6159/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so
 cannot be loaded.
firefox[25117]: GTK+ module 
/snap/firefox/6159/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so
 cannot be loaded.#012GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in 
the same process is not supported.
firefox[25117]: Failed to load module "canberra-gtk-module"

and

thunderbird_thunderbird.desktop[9646]: [9646, Main Thread] WARNING: GTK+ module 
/snap/thunderbird/721/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so
 cannot be loaded.
thunderbird-bin[9646]: GTK+ module 
/snap/thunderbird/721/gnome-platform/usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so
 cannot be loaded.#012GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in 
the same process is not supported
thunderbird-bin[9646]: Failed to load module "canberra-gtk-module"


Also, the following applications throw messages like `Failed to load module 
"canberra-gtk-module"` during start up:


doublecmd (doublecmd-common/plucky,plucky,now 1.1.22-1build1 all [installed])
opera (119.0.5497.40 / snap)
xsane 0.999 (xsane/plucky,now 0.999-12.2 amd64 [installed])
lazarus-ide 4.0 (lazarus-project/now 4.0.0 amd64 [installed,local])
... and any programs created using `lazarus-ide`.

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https://bugs.launchpad.net/bugs/2111252

Title:
  E: Package 'libcanberra-gtk-module' has no installation candidate

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