Linux Mint Forums

https://imgur.com/KfOX8nh As I activate them I am not a programmer This is the second reinstallation I do

This was the response of the terminal : ~$ sudo update -ca-certificate
[sudo] password for sofia:
sudo: update: command not foun

Good afternoon I have installed LMDE 4 but I cannot install anything, neither by synaptic nor by terminal notifications appear about certificates that are absent or that do not exist I am tied hand and foot I cannot configure the OS because I cannot install anything How can I solve it?