Try this:

ar t /home/rogerb/Downloads/google-musicmanager-beta_current_amd64.deb

Is the data.tar inside lzma compressed? If yes then this is a dupe of
868188.

You can work around it in one of three ways

1. Installing with dpkg 
2. Installing either the lzma or xz-lzma packages as they provide /usr/bin/lmza
3. setting up your own symlink such that /usr/bin/lmza points to /usr/bin/xz

Remember to mark this as a duplicate if it is your issue.

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https://bugs.launchpad.net/bugs/869685

Title:
  Always fails to install 3rd party debs

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