I believe this bug is caused because you are using Ubuntu 18.04 LTS but you have set up apt repositories from a PPA (or something else) that are incompatible with Ubuntu 18.04 LTS.
Because your issue isn't in the official Ubuntu 18.04 LTS packages, I am closing this bug. ** Changed in: mutter (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1935663 Title: The following packages have unmet dependencies: gsettings-desktop- schemas : Breaks: mutter (< 3.31.4) but 3.28.4+git20200505-0ubuntu18.04.2 is to be installed E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages. Status in mutter package in Ubuntu: Invalid Bug description: The following packages have unmet dependencies: gsettings-desktop-schemas : Breaks: mutter (< 3.31.4) but 3.28.4+git20200505-0ubuntu18.04.2 is to be installed E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: mutter 3.28.4+git20200505-0ubuntu18.04.2 ProcVersionSignature: Ubuntu 5.4.0-67.75~18.04.1-generic 5.4.94 Uname: Linux 5.4.0-67-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.20.9-0ubuntu7.23 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Fri Jul 9 11:23:54 2021 InstallationDate: Installed on 2021-02-27 (131 days ago) InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1) SourcePackage: mutter UpgradeStatus: Upgraded to bionic on 2021-03-24 (106 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1935663/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp