You had both obcore-testing and observice-testing enabled and you followed the procedure on
https://web.obarun.org/index.php?id=111
And you still get this screen as above?
Enter your root password and then try
66-enable -t boot -S boot
See if you have any errors and what are they.
If no errors Ctrl-Shift-F12 should give you tty12, do you get a login screen?
You can only login as user from there, so login.
su (superuser) and pw
# 66-enable -t root -S tty@ tty1 tty@ tty2
Are the messages positive (enabled/started)?
# 66-info -T > /tmp/66status
This will output the 66-info for current trees into a file /tmp/66status , see if you can post it here. If you have gotten positive results from the above procedure you should be able to log in.
If things are not working and you are at emergency shell (starting screen)
# cat /etc/66/init.conf
Does it say boot next to the line that starts with tree? If it says tmpboot you have to change it to boot, this means you got stuck in the middle stage of the procedure.
66-tree -R tmpboot
nano /etc/66/init.conf
change tmpboot to boot
66-tree -R boot
66-tree -n boot
66-enable -t boot -C -S boot