When i try to update the repository using the command : sudo apt-get update
It didnt asked for passowrd nor username and update also not completed . It prompted the below error:
user@ubuntu:~$ sudo apt-get update
[sudo] password for user:
E: Could not get lock /var/lib/apt/lists/lock – open (11: Resource temporarily unavailable)
E: Unable to lock directory /var/lib/apt/lists/
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?