could not get lock /var/lib/dpkg code example

Example 1: apt lock

rm -rf /var/cache/apt/* /var/lib/dpkg/lock /var/lib/dpkg/lock-frontend \
/var/cache/debconf/ /var/lib/apt/lists/* \
/var/lib/dpkg/lock /var/lib/dpkg/lock-frontend /var/cache/debconf/

Example 2: how to realse the lock in the linux in apt

sudo kill <process_id>