jonathan@Matryoshka:~$ ubuntu-device-flash --clean-cache touch
2015/07/25 15:06:50 Cleaning prevously downloaded content
jonathan@Matryoshka:~$ ubuntu-device-flash touch --channel=ubuntu-touch/rc-proposed/ubuntu --bootstrap
2015/07/25 15:07:12 Expecting the device to be in the bootloader... waiting
2015/07/25 15:07:12 Device is |flo|
2015/07/25 15:07:14 Flashing version 196 from ubuntu-touch/rc-proposed/ubuntu channel and server https://system-image.ubuntu.com to device flo
6.41 MB / 6.41 MB [==============================================================================================================================] 100.00 % 125.49 KB/s
46.55 MB / 46.55 MB [============================================================================================================================] 100.00 % 141.60 KB/s
286.91 MB / 286.91 MB [========================================================================================================================>_] 100.00 % 274.76 KB/s
2015/07/25 15:25:36 Start pushing /home/jonathan/.cache/ubuntuimages/ubuntu-touch/rc-proposed/ubuntu/flo/version-196.tar.xz to device
2015/07/25 15:25:36 Start pushing /home/jonathan/.cache/ubuntuimages/gpg/image-master.tar.xz to device
2015/07/25 15:25:36 Start pushing /home/jonathan/.cache/ubuntuimages/gpg/image-signing.tar.xz to device
2015/07/25 15:25:36 Start pushing /home/jonathan/.cache/ubuntuimages/pool/custom-fc1fc3b75a49b83c087310023f9cb6764e6a63d43474e3958a8f20df2a557002.tar.xz to device
2015/07/25 15:25:36 Start pushing /home/jonathan/.cache/ubuntuimages/pool/device-f8e719c9cc2f77e7caf8d559a09ebc430591dbae0d412c18e40e134a60bf2b3a.tar.xz to device
2015/07/25 15:25:36 Start pushing /home/jonathan/.cache/ubuntuimages/pool/ubuntu-cf2a714ed99493c86f19ba5e0884db190839b63e3d36cee5df4e1ba3a7c3aecf.tar.xz to device
2015/07/25 15:25:37 error pushing: failed to copy '/home/jonathan/.cache/ubuntuimages/gpg/image-master.tar.xz' to '/cache/recovery/': Is a directory

jonathan@Matryoshka:~$