UEFI & Ubuntu netinstall crashing

[AdrianSt]

Hi there,

I've tried launching Ubuntu's netinstall (precise/amd64) through iPXE and UEFI.
Sadly it crashes saying it cannot find the root block device.
Disabling UEFI and using BIOS it launches just fine.
The same happens with Fedora's netinstall.

Code:

VFS: cannot open root device "(null)" or unknown-block(0,0): error -6

I used these settings:

Code:

:ubuntu-trusty-amd64
initrd http://de.archive.ubuntu.com/ubuntu/dists/trusty/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64/initrd.gz
chain http://de.archive.ubuntu.com/ubuntu/dists/trusty/main/installer-amd64/current/images/netboot/ubuntu-installer/amd64/linux fb=false
boot || goto failed
goto start

:install_fedora
initrd http://ftp.uni-kl.de/pub/linux/fedora/linux/releases/20/Fedora/x86_64/os/images/pxeboot/initrd.img
chain http://ftp.uni-kl.de/pub/linux/fedora/linux/releases/20/Fedora/x86_64/os/images/pxeboot/vmlinuz inst.repo=http://ftp.uni-kl.de/pub/linux/fedora/linux/releases/20/Fedora/x86_64/os/
boot || goto failed
goto start