systemd-analyze

https://itsfoss.com/check-boot-time-linux/

https://www.wireguard.com/

Source: SuperGeekery: Automate daily database backups with crontab and SFTP and be the master your domain.

$ dpkg -l '*buntu-desktop' | grep ^ii
ii  xubuntu-desktop 2.225   amd64     Xubuntu desktop system

https://unix.stackexchange.com/questions/384796/how-to-determine-which-ubuntu-flavor-im-on

https://askubuntu.com/questions/760696/ubuntu-14-04-to-16-04-upgrade-failed

https://www.quora.com/Can-I-replace-my-UPS-12-V-7-Ah-battery-with-a-12-V-75-Ah-battery

Source: MicroK8s – Fast, Light, Upstream Developer Kubernetes