Desktop wallpaper is slightly blurry

This bug was fixed in the package mutter - 3.36.0-2ubuntu1

---------------
mutter (3.36.0-2ubuntu1) focal; urgency=medium

  * Merge with debian. Remaining changes:
    + debian/control:
      - Update VCS flags to point to ubuntu salsa branch
    + debian/gbp.conf: update branch to point to ubuntu/master
    + debian/patches/x11-Add-support-for-fractional-scaling-using-Randr.patch:
      - X11: Add support for fractional scaling using Randr
  * d/p/clutter-master-clock-default-Sync-timelines-to-hardware-v.patch:
    - Improves smoothness and reduce input-to-output latency
      levels (LP: #1862308)
  * debian/libmutter-6-0.symbols:
    - Update as per background mipmap levels patch symbol addition
  * Ubuntu bugs resolved since 3.35.91-1ubuntu1:
    - Higher than necessary CPU usage on mouse movement (LP: #1848951)
    - No mouse cursor drawn for radeon in Wayland sessions (LP: #1867080)
    - Restarting displays apps running on other workspaces (LP: #1819890)
    - Volume/brightness OSD make fullscreen video flicker (LP: #1828697)

mutter (3.36.0-2) experimental; urgency=medium

  * control: Build against gnome-desktop 3.36 and break old gnome-shell. So we
    get dependencies on libgnome-desktop-3-19. Otherwise we get two different
    versions of gnome-desktop loaded into GNOME Shell, which crashes. Break
    old gnome-shell for the inverse reason - it needs to be upgraded otherwise
    we get the mismatch the other way around.

mutter (3.36.0-1) experimental; urgency=medium

  * New upstream release
    + Fix placement of popup windows in multi-monitor setups
    + Fix invisible mouse cursor on some hardware
    + Updated translations

mutter (3.35.92-1) experimental; urgency=medium

  * New upstream release
    + Add side channel for starting required X11 services
    + Allow remote desktop services to inhibit animations
    + Avoid flicker when (un)redirecting windows
    + Fix clipping glitches in long text entries
    + Fix visibility of initially hidden windows
    + Implement scaled/transformed hardware cursors
    + Let BindConstraints update the preferred size
    + Make check-alive timeouts configurable
    + Make each stage view correspond to a single CRTC
    + Make Xwayland startup asynchronous
    + Ping windows on every window focus
    + Remove overhead from hot code paths
    + Support synchronized wayland popup moving
    + Update screen-cast code to PipeWire 0.3 API
    + Use DMA buffers for screencasting if possible
  * d/p/*: Rebase
  * rules: Disable remote-desktop temporarily. This now requires pipewire 0.3
    which is not packaged yet and needs to be worked on
  * control: Bump wayland-protocols dep to 1.19 per meson.build
  * debian/libmutter-6-0.symbols: Add new symbols for this release. One symbol
    which was introduced in .90 was dropped; -6's ABI is not stable yet.

 -- Marco Trevisan (Treviño) <email address hidden> Thu, 19 Mar 2020 15:51:05 +0000

The fix for this is *not* in mutter 3.36.0-2ubuntu1 but we hope to get it into Ubuntu soon.

Will it be backported to focal fossa?

Yes I will aim to, eventually.

But first...

Patch to groovy proposed: https://salsa.debian.org/gnome-team/mutter/-/merge_requests/65

This bug was fixed in the package mutter - 3.37.91-1ubuntu1

---------------
mutter (3.37.91-1ubuntu1) groovy; urgency=medium

  * Merge with debian, including new upstream stable release, remaining changes:
    - debian/gbp.conf: update upstream branch to point to ubuntu/master
    - debian/patches/x11-Add-support-for-fractional-scaling-using-Randr.patch:
      + X11: Add support for fractional scaling using Randr
  * d/p/x11-Add-support-for-fractional-scaling-using-Randr.patch:
    - Refresh as per upstream changes

mutter (3.37.91-1) experimental; urgency=medium

  * New upstream release
    - Support unredirecting fullscreen wayland surfaces
    - Support area screencasts
    - Allow inhibiting remote access
    - Drive each monitor by its own frame clock (LP: #1730460)
    - Fix copy/paste failures on X11 (LP: #1879968)
    - Make window-aliveness checks less aggressive
    - Limit mipmap levels when rendering background (LP: #1862308)
    - Remove more long-deprecated Clutter APIs
    - Support custom keyboard layouts in $XDG_CONFIG_HOME/xkb
    - Optimize resource scale computation for wayland fractional scaling
    - Support tap-button-map and tap-drag-lock touchpad settings
    - Fix wine copy & paste
    - Add API to launch trusted wayland clients
    - Invalidate offscreen effect cache on video memory purge (LP: #1855757)
  * debian: Update package and file names to mutter API version
  * debian/control: Bump dependencies to match upstream requirements
  * debian/clean: Remove as HOME and XRD are managed now by dh
  * debian/copyright: Avoid redundant globbing patterns
  * debian/gbp.conf: target upstream/latest branch
  * debian/libmutter-7-0.symbols: Update symbols file
  * debian/patches: Refresh
  * d/p/debian/tests-Tag-closed-transient-no-input-tests-as-flaky.patch:
    - Renamed into d/p/debian/tests-Tag-unstable-tests-as-flaky.patch
    - Reduced the number of "flaky" tests to the ones time-dependent only
  * debian/rules:
    - Compute and generate a MUTTER_API_VERSION and replace it everywhere
    - Remove XDG_RUNTIME_DIR wrapper workaround
    - Don't run tests at all in riscv64
    - Don't set again default configuration values (it makes the delta clearer)
    - Never ignore test failures in amd64
    - Remove test num processes re-configuration
    - Run tests in s390x, no failures currently
    - Don't test in alpha hppa powerpc sparc64 x32 (Closes: #959415)
  * debian/with-temp-xdg-runtime-dir: Dropped, new dh will handle it for us
  * debian/watch: Scan for all versions, not just the stable-branch
  * debian/*.install: Use dh variable substitution in install files

mutter (3.36.5-1) unstable; urgency=medium

  * Team upload
  * New upstream release
    - Screencast fixes and improvements
    - Fix glitches when subsurfaces extend outside the toplevel
    - Improve background display in overview workspace switcher
    - Fix wine copy & paste
    - Plug memory leaks
  * Drop patches that were applied upstream

 -- Marco Trevisan (Treviño) <email address hidden> Fri, 28 Aug 2020 01:10:32 +0200

Focal side of the bug should have been fixed by https://launchpad.net/ubuntu/+source/mutter/3.36.6-1ubuntu0.20.04.1