Comment 18 for bug 1263811

@wolf-nir

I've been using the SuperSU (Chainfire) app from his website first and am currently using the one installed by the Ubuntu installer script, which again is Chainfires SuperSU v1.86

I've been trying to force "root" user and "system" user for the Ubuntu Dual Boot app (it is permanently accepted by SuperSU and other apps like TitaniumBackup are running well with it).

Creating the /cache/system manually and/or copying the ubuntu-boot.img to the "files" folder as mentioned before still gives me the following output:

[...]
Loading keyring: archive-master.tar.xz

/data/data/com.canonical.ubuntu.installer/files/ubuntu-boot.img is not a correct image.

SU granted
Starting image upgraded: Sat Dec 28 14:42:07 CET 2013
Processing the command file
Failed to unmount /cache/system with 22, Invalid argument
rm /data/data/com.canonical.ubuntu.installer/files/uTemp/update_command.applying
Creating SWAP device.

Setting up swapspace version 1, size = 536866816 bytes
UUID=[some uuid]
Done upgrading: Sat Dec 28 14:42:41 CET 2013

Missing update command