Public bug reported:

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)

** Affects: unity-tweak-tool (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug eoan

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https://bugs.launchpad.net/bugs/1845737

Title:
  Missing dependency on lenses

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