Do you see this message on every login to your Ubuntu system? "Could not load list of meta packages: [Errno 12] Cannot allocate memory". The error indicates there was not enough RAM available to complete the task. Here I explain where the message comes from and how to get rid of it.
Security is not a boolean proposition. It’s not “secure” versus “insecure”, “safe” versus “unsafe”, rather it is a spectrum of controls that all contribute to an overall security posture. There is no “fully”, there is no “completely”; every system – every single one – has weak points and a sufficiently well-equipped and determined adversary will find them. — Troy Hunt