O KDE acaba de entrar no mundo mobile com o Plasma Mobile. Para instalar, basta utilizar as ferramentas de instalação do Ubuntu Touch (post anterior). A imagem atual disponível é compatível com o Nexus 5, o mais bacana é o suporte aos widgets KDE Plasma. Testei esta madrugada durante o backup do meu notebook e compartilho aqui a receita de bolo.

ATENÇÃO:  Antes de iniciar deixo claro , que o leitor deste post é responsável por qualquer problema que venha a acontecer com o seu aparelho, logo: sendo de sua inteira responsabilidade e risco a utilização das instruções a seguir.

Primeiramente entre no bootloader.

$ adb reboot bootloader

a seguir utilize os comando abaixo para efetuar a instalação no seu Nexus 5

$ fastboot format cache
$ fastboot format userdata
erasing 'userdata'...
OKAY [ 14.161s]
formatting 'userdata' partition...
Creating filesystem with parameters:
 Size: 13725835264
 Block size: 4096
 Blocks per group: 32768
 Inodes per group: 8144
 Inode size: 256
 Journal blocks: 32768
 Label: 
 Blocks: 3351034
 Block groups: 103
 Reserved block group size: 823
Created filesystem with 11/838832 inodes and 93654/3351034 blocks
sending 'userdata' (137318 KB)...
writing 'userdata'...
OKAY [ 15.444s]
finished. total time: 29.606s

Agora utilize o comando ubuntu-device-flash

$ ubuntu-device-flash --server="http://kubuntu.plasma-mobile.org" touch --channel="kubuntu-phone/devel"
 --bootstrap --developer-mode --password 1234
WARNING --developer-mode and --password are dangerous as they remove security features from your device
2015/07/27 22:07:29 Expecting the device to be in the bootloader... waiting
2015/07/27 22:07:29 Device is |hammerhead|
2015/07/27 22:07:29 Flashing version 17 from kubuntu-phone/devel channel and server http://kubuntu.plasma-mobile.org to device hammerhead
45.89 MB / 45.89 MB     [====================================] 100.00 % 312.29 KB/s 
467.05 MB / 467.05 MB [====================================] 100.00 % 323.41 KB/s 
2015/07/27 22:32:31 Start pushing /home/visitante/.cache/ubuntuimages/pool/keyring-14bdcbd37d9650acb04357018c679bc60b7faeda58bab8b9de82e74ab9af0814.tar.xz to device
2015/07/27 22:32:31 Start pushing /home/visitante/.cache/ubuntuimages/kubuntu-phone/devel/hammerhead/version-17.tar.xz to device
2015/07/27 22:32:31 Start pushing /home/visitante/.cache/ubuntuimages/gpg/image-master.tar.xz to device
2015/07/27 22:32:31 Start pushing /home/visitante/.cache/ubuntuimages/gpg/image-signing.tar.xz to device
2015/07/27 22:32:31 Start pushing /home/visitante/.cache/ubuntuimages/pool/device-4510865a678843b2523e9e7ef5df965898150028fd566db0ed410e604855e19d.tar.xz to device
2015/07/27 22:32:31 Start pushing /home/visitante/.cache/ubuntuimages/pool/ubuntu-696b10ac6ced5469c6666d81e3fe12e312aa15e17a8b9e781197f834aeebe0fc.tar.xz to device
2015/07/27 22:32:31 Done pushing /home/visitante/.cache/ubuntuimages/pool/keyring-14bdcbd37d9650acb04357018c679bc60b7faeda58bab8b9de82e74ab9af0814.tar.xz to device
2015/07/27 22:32:31 Done pushing /home/visitante/.cache/ubuntuimages/kubuntu-phone/devel/hammerhead/version-17.tar.xz to device
2015/07/27 22:32:31 Done pushing /home/visitante/.cache/ubuntuimages/gpg/image-master.tar.xz to device
2015/07/27 22:32:31 Done pushing /home/visitante/.cache/ubuntuimages/gpg/image-signing.tar.xz to device
2015/07/27 22:32:43 Done pushing /home/visitante/.cache/ubuntuimages/pool/device-4510865a678843b2523e9e7ef5df965898150028fd566db0ed410e604855e19d.tar.xz to device
2015/07/27 22:33:44 Done pushing /home/visitante/.cache/ubuntuimages/pool/ubuntu-696b10ac6ced5469c6666d81e3fe12e312aa15e17a8b9e781197f834aeebe0fc.tar.xz to device
2015/07/27 22:33:44 Created ubuntu_command: /home/visitante/.cache/ubuntuimages/ubuntu_commands279073856
2015/07/27 22:33:44 Rebooting into recovery to flash

$ sudo resize-root-partition/pre>

Para finalizar o vídeo oficial do projeto (Fonte: Helio Castro, obrigado):