My System: Dell XPS 13 (2015) (9343)
I had the same problem until now.
Today I tried to install again with desktop-amd64.iso of April 17, 2015.
This time it installed correctly and I could boot without any problems.
Installed in UEFI Mode, Secure boot off.
After one successful boot I enabled secure boot. No problems.
Seems to be fixed?!
My System: Dell XPS 13 (2015) (9343)
I had the same problem until now.
Today I tried to install again with desktop-amd64.iso of April 17, 2015.
This time it installed correctly and I could boot without any problems.
Installed in UEFI Mode, Secure boot off.
After one successful boot I enabled secure boot. No problems.
Seems to be fixed?!