unable to add/remove program in Ubuntu 12.04 LTS?

Posted by Manish Kumar Chauhan on Ask Ubuntu See other posts from Ask Ubuntu or by Manish Kumar Chauhan
Published on 2012-11-14T15:49:41Z Indexed on 2012/11/14 17:30 UTC
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my problem is as following: unable to add/remove any program using either update-manager or Synaptic Package Manager or terminal

  1. update-manager is asking for partial upgrade and while updating software-center 5.6.2 catalog , there is no progress beyond the line "this is may take a moment"
  2. synaptic is unable to obtain an exclusive lock, similarly can't do terminal command
    sudo apt-get update
  3. if i try to break down the lock using the command

    sudo fuser -cuk /var/lib/dpkg/lock; sudo rm -f /var/lib/dpkg/lock

    it turns off my monitor display and i have to restart the whole system.

    note: this whole trouble started ,when i found ubuntu software-center missing after adding a repository and reinstalled it.

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