Hi there! This post is part of a series I am doing where I attempt to move most of the applications I use at home over to Linux. If you find this interesting you may enjoy the other posts too!
The first thing I do with any new system installation is ensure that the correct date, time and timezone is configured. I ran into an issue a while back when working on an old image of DietPi and was not able to update packages, long story short the systems date was about a year out and causing SSL certificates to become invalid.
Needless to say this has now become one of the first things I do when setting up a new system. In Ubuntu setting the date / time is as easy as running the below command:
$ sudo dpkg-reconfigure tzdata
Just follow the on-screen prompts to configure everything (and if possible reboot your system afterwards) - that's all there is to it.