I started to see the warning/error displayed when starting the emulator “Extra package installation is failed. cert must be installed MANUALLY”. Nothing changed, that I was aware of, i.e. no new installations or the likes.

I found that if you go to (on Windows)

%USERPROFILE%/SamsungCertificate

then delete the Cert folder (probably a good idea to back up first), then open the emulator again (I also opened the cert manager, but I think the cert folder was recreated when the emulator started and no more warnings/errors) then everything worked again.

However this seems to be something that keeps happening, if I find out why I’ll update this post.