grub2 user interface disappears after upgrade from stretch to testing

Shane Dev <[email protected]>
Newsgroups gmane.linux.debian.user.testing
Message-ID <CALuWMFnHRGuHOpnXPaqFLr1hi1zj-yLoPkznZRfrc5td8+TwpQ@mail.gmail.com> 
Hello, I downloaded firmware-9.6.0-amd64-netinst.iso and successfully
installed a minimal debian stretch on my UEFI/GPT disk. After rebooting, I
was presented with the grub2 text user interface and the possibility to
boot Debian or my Windows boot manager - as expected.

Following https://wiki.debian.org/DebianTesting, I
edited /etc/apt/sources.list and changed stretch to testing, apt update &&
apt upgrade. Everything seemed ok but when I rebooted, the grub2 user
interface was gone and I could not find a way to boot Debian. Any ideas?

Shane
lmpx.com only provides a reader for public news (NNTP) servers. It is not affiliated with the servers or forums shown here and is not responsible for the content of articles, which is written by their respective authors.