Lock problem with Linux Operating System KNOPPIX 7.4

I got a ' lock problem ' with my Linux Operating System KNOPPIX 7.4 when I run the Linux command ' aptitude update ' . The ' lock problem ' is shown below :

root@Microknoppix:/etc/apt#

root@Microknoppix:/etc/apt#

root@Microknoppix:/etc/apt# aptitude update

E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable)

E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?

W: Could not lock the cache file; this usually means that dpkg or another apt tool is already installing packages. Opening in read-only mode; any changes you make to the states of packages will NOT be preserved!

E: Could not get lock /var/lib/apt/lists/lock - open (11: Resource temporarily unavailable)

E: Unable to lock directory /var/lib/apt/lists/