could not get lock /var/lib/dpkg/lock-frontend. it is held by process 5718 code example

Example 1: E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), is another process using it?

sudo lsof /var/lib/dpkg/lock
sudo lsof /var/lib/apt/lists/lock
sudo lsof /var/cache/apt/archives/lock

Example 2: how to fix could not fix var lock /var/lib/dpkg/lock ubuntu

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