Unable to locate package koha-common

I just have installed Koha on Ubuntu 16.4. But due to some reasons I have uninstalled it. Now I am trying to install it again but now it is telling E: unable to locate package. Please help.

Results of sudo apt update:

E: Could not get lock /var/lib/apt/lists/lock- open (11: Resources temporarily unavailable). 
E: Unable to lock directory /var/lib/apt/lists/

As far as I can see, you error message says Unable to lock directory /var/lib/apt/lists/ and not E: unable to locate package.

If the error is: Unable to lock directory /var/lib/apt/lists/ that means that other package manager could be running in background, so please execute the following to check for that:

ps aux | grep '[a]pt'

If in the output of this command there's a process running using apt-get, then the best action to take is to wait for some time until it finishes. Otherwise you can kill it using:

sudo pkill -f or sudo killall -s KILL

After you're sure that there is no process using apt, you can remove the lock file using:

sudo rm /var/lib/apt/lists/lock

And then try to re-install koha-common with the command:

sudo apt-get install koha-common

Hope it helps.