To know which packages depend on a specific package, I can run:
$ apt rdepends <package>
example:
$ apt rdepends netcat-openbsd
netcat-openbsd
Reverse Depends:
Recommends: libvirt-daemon
Recommends: libvirt-daemon
Depends: xletters
Depends: tomcat10-user
|Depends: rtpengine-utils
Suggests: mariadb-server
|Depends: ifupdown-extra
Depends: freedombox
Depends: ubuntu-minimal
Snap packages don't typically have as many dependencies outside of core/gnome, but this is still wanted in some cases.
For example, if I have multiple snap core packages, it isn't obvious how to identify which snaps depend on a specific version of core.
Name Version Rev Tracking Publisher Notes
...
core18 20240416 2823 latest/stable canonical✓ base
core20 20240416 2318 latest/stable canonical✓ base
core22 20240408 1380 latest/stable canonical✓ base
...
While specific example has already been answered[1] elsewhere, it isn't a generic solution. Answering this question for snaps which depend on gnome and gtk themes are not answered in that question.
[1] Expecting the user to understand the snap configuration file and read these files on disk makes this feel like an afterthought to snap's user interface.
