The /etc/dconf/profile/user file in some distributions is part of dconf
package, in some not. There are even cases where it changes between
package versions (Fedora 27 don't have it, but Fedora 28 do).
Also, base Debian Stretch don't have it, but Kali Linux based on it do.
To avoid overly complex dependency handling, create the file dynamically
on package installation if it's missing in that particular case. The
file content is canonical:
user-db:user
system-db:local
FixesQubesOS/qubes-issues#3834
(cherry picked from commit 23250f84b2)
503a7fdf59