Missing dependency on lenses

[Egmont Koblinger]

For some (unknown) reason, my unity-lens-* packages got uninstalled.

Trying to start unity-tweak-tool from a terminal under a Unity 7 session gives this error in the terminal:

    Error: schema com.canonical.Unity.ApplicationsLens not installed

and this in a popup window:

    Schemas missing [<- this is the window title]

    The following schema is missing

    com.canonical.Unity.ApplicationsLens

    In order to work properly, Unity Tweak Tool recommends you install the necessary packages

And if I install the requested "applications" lens and restart unity-tweak-tool, the same error is presented for the "files" lens instead.

Either the package should depend on these two lens packages, and the wording "recommends" in the error message should be changed to "requires" (just in case someone manages to break those packages); or according to the wording of "recommends" these packages should be optional dependencies and their lack should not result in startup failure.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: unity-tweak-tool 0.0.7+-0ubuntu5
ProcVersionSignature: Ubuntu 5.3.0-12.13-generic 5.3.0
Uname: Linux 5.3.0-12-generic x86_64
ApportVersion: 2.20.11-0ubuntu7
Architecture: amd64
CurrentDesktop: Unity:Unity7:ubuntu
Date: Sat Sep 28 00:11:10 2019
InstallationDate: Installed on 2016-11-09 (1051 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
PackageArchitecture: all
SourcePackage: unity-tweak-tool
UpgradeStatus: Upgraded to eoan on 2019-09-08 (18 days ago)

[Egmont Koblinger (egmont-gmail)]

I forgot to explicitly say: The required packages, which should be listed in the Depends field, are:
- unity-lens-applications
- unity-lens-files

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.