Comment # 23 on bug 944578 from M.B. Peters

Can only boot as legacy:

When using F3 (Video Mode) = No KMS
and boot options plymouth=0 textmode=1

Again I end up in different states, but always locked up!

Noticed two times that the boot sequence ended with: ">usb.2:usb"
as last line.

Inside the box is a "Transcend TS-PDU3" i/o card installed with
two external USB 3.0 ports (a PCI-Express 2.0 card)

Removed the card and see the install went and for the first time
I looked at the installation screen!

Went as far as the "partition suggestions" screen and aborted.

Placed back the card and see the same problems as before.
Removed the card all together and tried a second install.

Went flawless without any problems but...(maybe another bug-rapport?)

My desktop favourite is KDE, so I accepted the default options.
When the installation started everything went well until "image KDE"
was installed. 
At 100% of installing "image KDE" the system started again with the 
installation procedure from a non graphical screen.

After excepting again all the proposed values the installation started and 
again at 100% of installing "image KDE" the installation started again
from a non graphical screen.

Tried this 3 times with every time aborting installation at 100% installing
of "image KDE" (images KDE [base], KDE [Xorg] and KDE [desktop] installed
without problems!) and falling back tot the non graphical install screen.

Started again from DVD and selected "GNOME" as desktop. 
Installation finished without any problem.
Leap runs like a breeze. But not with my Desktop of choice!