This bug was fixed in the package unity - 5.18.0-0ubuntu1

---------------
unity (5.18.0-0ubuntu1) precise-proposed; urgency=low

  * New upstream release.
    - Launcher: start the drag icon request from the original mouse-down
      position. (LP: #858540)
    - Ignore transient unmmaped windows on minimize/unminimize
      (LP: #929712)
    - Fixes alt+tab losing focus when alt+tabing to quickly due to ubus
      being to slow to send a message (LP: #1035628)
    - If no icon is found then use the default one. This will cause all
      blank icons to be a '?' icon (LP: #886778)
    - Use GMountOperation in g_volume_mount. GMountOperation provides a
      mechanism for interacting with the use. (LP: #713432)
    - Do not reuse the menu entries if their order changes (LP: #1062283)
    - BamfLauncherIcon: ensure the icon and name values when the running
      state changes. This avoids to get "?" icons. (LP: #772986)
    - Use linear filtering to draw icons (when needed). (LP: #1036231)
 -- Timo Jyrinki <[email protected]>   Mon, 12 Nov 2012 14:17:04 +0200

** Changed in: unity (Ubuntu Precise)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1036231

Title:
  Icon resized between 32 - 48 - 64 look jaggy

Status in Unity:
  Fix Released
Status in Unity 5.0 series:
  Fix Released
Status in “unity” package in Ubuntu:
  Fix Released
Status in “unity” source package in Precise:
  Fix Released

Bug description:
  [Impact]

  Ugly icon resizing method hindering user experience.

  [Test Case]

  Observe scaled icons in Launcher before and after when Launcher icon
  size is non-even (for example 57) - jagged edges should change to
  smooth.

  [Regression Potential]

  Non-scaled icons should not become blurrier.

  ---

  
  The resize is done with nearest interpolation which is a poor, 
loosing-information algorithm. It should use at least linear filter or if 
possible bicubic interpolation for a smooth resize and appearence

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xorg 1:7.6+12ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
  Uname: Linux 3.2.0-29-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.0.1-0ubuntu12
  Architecture: amd64
  CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  CompositorRunning: compiz
  Date: Mon Aug 13 10:50:08 2012
  DistUpgraded: Fresh install
  DistroCodename: precise
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   NVIDIA Corporation GF108 [GeForce GT 430] [10de:0de1] (rev a1) (prog-if 00 
[VGA controller])
     Subsystem: ZOTAC International (MCO) Ltd. Device [19da:4199]
  MachineType: System manufacturer System Product Name
  ProcEnviron:
   LANGUAGE=en_US:
   PATH=(custom, no user)
   LANG=en_US
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-29-generic 
root=UUID=d7772776-869d-4d7a-ac4c-c17ee552ac85 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/17/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3506
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8Z68-V LX
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr3506:bd01/17/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP8Z68-VLX:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  version.compiz: compiz 1:0.9.7.8-0ubuntu1.2
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.32-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1.2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20111219.aacbd629-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20111201+b5534a1-1build2

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