I'm unable to install any of the programs from Ubuntu Software Center. It constantly stays at 0 % with the following message: 'Waiting for other software manager to quit.' How could I solve this problem?


Do you have synaptic or the ubuntu software center open?Have a look under processes.

To see running processes goto System-->Administration-->System Monitor

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Search for the processes that says apt-get or synaptic.If you find any process,select the process and click End Process.

If no process were running but still if you cant install any packages then type the following in terminal..

sudo rm /var/lib/dpkg/lock

This will remove the lock,now you can install packages..

Also See this post

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  • Thank you for help! There were no apt-get or synaptic processes. Were exactly I need to type in: sudo rm /var/lib/dpkg/lock ? – Agnese Nov 19 '10 at 8:55
  • Yes type that, it removes any lock on dpkg that you might have. – karthick87 Nov 19 '10 at 9:02
  • Were do I type it in? – Agnese Nov 19 '10 at 9:11
  • Type that in terminal.To open terminal Goto Applications-->Accessories-->Terminal – karthick87 Nov 19 '10 at 10:33
  • After I pasted sudo rm /var/lib/dpkg/lock in the terminal it required my password. I keep writing it in but the system wont accept it. – Agnese Nov 19 '10 at 13:03

It is likely that you have a terminal process or synaptic currently "in charge" of installing software. Ubuntu stops new programs that are in charge of installing/removing/updating software from starting when there is an existing application/process that has the same function. You probably just need to wait for an application you were previously using to close/relinquish software changing rights and/or close that process if you have not already done so.

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  • 1
    E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem. E: _cache->open() failed, please report. – Agnese Nov 19 '10 at 8:07
  • I can't make any updates as well. How do I run 'sudo dpkg' manually? – Agnese Nov 19 '10 at 8:09

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