"Could not get lock /var/lib/apt/lists/lock" (Ubuntu)

Me

"Could not get lock /var/lib/apt/lists/lock" (Ubuntu)

1. Open the terminal and run one of these commands:

root@penreturns:~$ sudo rm /var/lib/apt/lists/lock

or

root@penreturns:~$ rm -f /var/lib/apt/lists/lock

or

root@penreturns:~$ killall -9 apt-get aptitude

Then make an update with this command:

root@penreturns:~$ sudo apt-get update

2. Also, If you receive this error:

E: Could not get lock /var/lib/dpkg/lock

Via the terminal, run this command to unlock it:

root@penreturns:~$ rm -f /var/lib/dpkg/lock

Then update with this command:

root@penreturns:~$ sudo apt-get update

If you have more solutions for this error, then add them in the comment form given below.

Enjoy.

*copy code without root@penreturns:~$