After installing the OS(both in general and especially Ubuntu/any Linux) , Do we need to install root certificates separately?

I have installed ubuntu-20.04-desktop-amd64.iso in Oracle VM VirtualBox. The details are above. I have tried both Minimal Installation and Normal Instalation type while installing Ubuntu. The following problem is in both instances.

When I tried to open Google.com earlier in firefox, I got error code sec_error_unknown_issuer on clicking advanced button. There is no button accept the risk and continue

After few minutes I was working in Host OS(windows 10) I tried again now I got error code as MOZZILA_PKIX_ERROR_MITM_DETECTED with accept the risk and continue button. I can't understand what changed the error code and made the accept and continue option available.

Also I tried from earlier to install postman from terminal by this comman

sudo snap install postman

It's always failing

error: cannot install "postman": Post x509: certificate signed by unknown authority

In /usr/share/ca-certificates directory there is only one directory name mozilla

After researching about certificate authority, I guess I may need to install a root certificate. But I got my question now, "Won't Ubuntu installation take care of installing root certificate ?"

Do we need to install root certificate after installing OS (windows, Mac or any OS) ?

1 Answer

No, users don't need to install any certificates separately to access websites like google.com or Bing.com

This certificate issues were solved by disabling BC Unified Agent