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I get the following message: 

An unresolvable problem occurred while initializing the package information.
Please report this bug against the 'update-manager' package and include the following error message:
'E:Type 'b-src' is not known on line 2 in source list /etc/apt/sources.list.d/cdemu-ppa-precise.list'
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  • Run sudo mv /etc/apt/sources.list.d/cdemu-ppa-precise.list /etc/apt/sources.list.d/cdemu-ppa-precise.list.bak and then try to open update-manager or software center.
    – heemayl
    Mar 2, 2015 at 22:43
  • Let me put that as an answer, select that as the answer to your question so that the issue can be marked as solved..
    – heemayl
    Mar 2, 2015 at 22:51
  • check my answer..
    – heemayl
    Mar 2, 2015 at 22:55

1 Answer 1

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The issue is due to the malformed source list of the CDEmu PPA. Run the following command to rename the source list of teh PPA and then open software center or update manager:

sudo mv /etc/apt/sources.list.d/cdemu-ppa-precise.list /etc/apt/sources.list.d/cdemu-ppa-precise.list.bak

Also seems that CDEmu has dropped the support for Ubuntu 12.04, so you can remove the source list of CDEmu if you want.

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