Fix "could not get lock /var/lib/dpkg/lock" Error Once and For All (Ubuntu)

The “could not get lock /var/lib/dpkg/lock” error is pretty common in Debian/Ubuntu running in virtual machine. Existing workarounds on the Internet (i.e. kill the apt-get process, or remove the lock file) are not ideal, because you will face the same error again in the future.
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Fix "could not get lock /var/lib/dpkg/lock" Error Once and For All (Ubuntu)