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Since I am using my servers in an offline environment I usually mirror the ubuntu archive - works perfectly! Now shocking I found that chromium-browser is a snap app in U20.04 LTS. So it does not install unless you are really connected to the internet. This renders the idea of apt-mirror completely useless.

I just wonder if there are any other apps using snap. And I like to know this before I continue migrating all servers.

Maybe I have to walk through each apt package and see if it has a snap dependency?

thx

mook765
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thomas
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    There is no single list or master plan that we can point you to. Each project decides for themselves if they wish to distribute by deb or snap or something else, and they can change their minds at any time. The Chromium packagers, for example, switched because it reduced their workload. – user535733 Feb 11 '21 at 13:18
  • the only idea from me first make a simulation. apt -s install package-name – nobody Feb 12 '21 at 13:55

2 Answers2

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You can check the reverse dependencies of the snapd-package:

$ apt rdepends snapd | grep "Depends"


WARNING: apt does not have a stable CLI interface. Use with caution in scripts.


Reverse Depends:
Depends: snap-confine (= 2.57.5+22.04ubuntu0.1)
Depends: ubuntu-snappy-cli
Depends: ubuntu-snappy
Depends: ubuntu-core-snapd-units
Depends: ubuntu-core-launcher (= 2.57.5+22.04ubuntu0.1)
Depends: snapd-xdg-open (= 2.57.5+22.04ubuntu0.1)
Depends: snap-confine (= 2.55.3+22.04)
Depends: plasma-discover-backend-snap
Depends: gnome-software-plugin-snap
Depends: ubuntu-image
Depends: livecd-rootfs (>= 2.39)
Depends: ubuntu-snappy-cli
Depends: ubuntu-snappy
Depends: ubuntu-core-snapd-units
Depends: ubuntu-core-launcher (= 2.55.3+22.04)
Depends: snapd-xdg-open (= 2.55.3+22.04)
PreDepends: snapcraft
Depends: livecd-rootfs (>= 2.39)
Depends: plasma-discover-backend-snap
Depends: gnome-software-plugin-snap
PreDepends: ember
PreDepends: cyphesis-cpp
PreDepends: chromium-browser
Depends: ubuntu-server-minimal
Depends: ubuntu-image
PreDepends: firefox

We could even shorten the list if we look for PreDepends:

~$ apt rdepends snapd | grep "PreDepends"


WARNING: apt does not have a stable CLI interface. Use with caution in scripts.


PreDepends: snapcraft
PreDepends: ember
PreDepends: cyphesis-cpp
PreDepends: chromium-browser
PreDepends: firefox

This are the transitional packages which install the applications as a snap package. The output may differ depending on the Ubuntu version you use.

mook765
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2

Most of apt packages can't have snap apps as dependency(unless it is a Transitional package) and most of snap apps can't have apt packages as dependency(only snapd).

Extra helpful commands:

Use snap info <app> to see info about snap apps and apt info <package> to see info about apt packages.

Use snap list to see all packages installed by snap and apt list --installed to see all packages installed by apt, it can be a very long list.

Mandi
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