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Fix Could not get lock /var/lib/apt/lists/lock Ubuntu

Fix “Unable to lock the administration directory (/var/lib/dpkg/)” in Ubuntu

While using the apt-get command or the relatively new APT package management tool in Ubuntu Linux or its derivatives such as Linux Mint (which I actually use as my primary operating system for doing

Fix Username is not in the sudoers file in Ubuntu

How to Fix “Username is not in the sudoers file. This incident will be reported” in Ubuntu

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In Unix/Linux systems, the root user account is the super user account, and it can therefore be used to do anything and everything achievable on the system. However, this can be very dangerous in