ubuntu dpkg lock error blogger code example

Example 1: how to fix could not fix var lock /var/lib/dpkg/lock ubuntu

sudo rm /var/cache/apt/archives/lock
sudo rm /var/lib/dpkg/lock

Example 2: why upgrade ubuntu then frequently shows this message "It iwating for cache lock: Could not get lock /var/lib/dpkg/lock.frontend.

It iwating for cache lock: Could not get lock /var/lib/dpkg/lock.frontend.