Comment 2 for bug 1798322

It seems to be a secure boot / UEFI issue. Retrying with the same bootentry and a minimal install also failed. I briefly saw something about grub not being able to write somewhere in the install console.

Unfortunately I am not able to copy the text here, because the error message box of the installer went above that. It would be nice if one could investigate the output of the installer a bit more. It seems it is not attached automatically here. Also after closing that message box the installer console immediately dissapears, not very helpful to produce a proper report.

When I selected a different boot entry for my USB-Stick (one without UEFI in the name) I was able to install ubuntu without any problems.