I have installed the sun java6-jdk package but it's not installed completely. After that it's giving an error when I try to install a new package.

In terminal when I write "sudo apt-get install [any package name]" I get an error like this:

E: could not get lock /var/lib/dpkg/lock -open (11 Resource temporable )
E: Unable to lock the administration directory (/var/lib/dpkg).

Also Synaptic package manager is not opening and none of the packages are downloading through any of the methods I know.

Please help!