I install different desktops to learn how to navigate and use them. I'm not all that picky about how I access applications. Unity dash or Synapse on XFCE both get the job done quite well .I never get why you'd want a back up desktop
There are plenty themes icons and some nice customization tools for Unity that are not available on 12.04. Unity has come a long way since 12.04, but that doesn't keep me from trying different window managers. XFCE has been one of my favorites on the last three Ubuntu versions. PPA's all have potential problems and are use at your own risk ! Even if a PPA works great for me it may not for another person with different hardware.I mean, orange and purple?
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