Waiting for cache lock: Could not get lock /var/lib/dpkg/lock-frontend installing mysql code example

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

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

Example 2: E: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?

$ sudo dpkg --configure -a
dpkg: error: parsing file '/var/lib/dpkg/updates/0004' near line 0:
newline in field name '#padding'