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
https://api.snapcraft.io/v2/snaps/refresh: 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) ?