I've just installed Ubuntu 16.04 LTS but it does not boot. The Error on the screen is 'Default Boot Device Missing or boot failed'. Secure Boot is enabled and Boot mode is Uefi.
edit:
Now after the error shows up I get to a menu where I can select LinplusLite. After another error I can select ubuntu, then the system boots fine. Here is the link to the boot-repair output:
http://paste.ubuntu.com/p/NJfxXBZqfK/
The output of
sudo efibootmgr -v
looks like this:
https://paste.ubuntu.com/p/Jp42SY89pB/
Thanks for helping