Comment 3 for bug 1923311

I have the ddebs sources added:
deb http://ddebs.ubuntu.com focal main restricted universe multiverse
deb http://ddebs.ubuntu.com focal-updates main restricted universe multiverse
deb http://ddebs.ubuntu.com focal-proposed main restricted universe multiverse

But the dbgsym version does not match the package version:

$ apt list nautilus -a
nautilus/focal-updates,now 1:3.36.3-0ubuntu1 amd64 [installiert]
nautilus/focal 1:3.36.1.1-1ubuntu2 amd64

$ apt list nautilus-dbgsym -a
nautilus-dbgsym/focal 1:3.36.1.1-1ubuntu2 amd64

After nautilus has been updated to version "1:3.36.3-0ubuntu1" the -dbgsym package stayed at version "1:3.36.1.1-1ubuntu2". So I cannot install "nautilus-dbgsym" and run gdb with the debug symbols to check where it crashes.

Anyway, this issue is pretty easy reproducible on my side and occurs every time.